Rollup of 9 pull requests

[kennytm]

Successful merges:

• Deny bare trait objects in src/librustc_errors #52286 (Deny bare trait objects in src/librustc_errors)
• Reduce the number of clone()s needed in obligation_forest #52306 (Reduce the number of clone()s needed in obligation_forest)
• update miri #52338 (update miri)
• Pass edition flags to compiler from rustdoc as expected #52385 (Pass edition flags to compiler from rustdoc as expected)
• AsRef doc wording tweaks #52392 (AsRef doc wording tweaks)
• update nomicon #52430 (update nomicon)
• Enable incremental independent of stage #52434 (Enable incremental independent of stage)
• Calculate the exact capacity for 2 HashMaps #52435 (Calculate the exact capacity for 2 HashMaps)
• Block beta if clippy breaks. #52446 (Block beta if clippy breaks.)

r? @ghost

[kennytm]

@bors r+ p=6

[bors]

📌 Commit 6626522df79ead3f0c1dfed4dcf47774f92e0d94 has been approved by kennytm

[bors]

⌛ Testing commit 6626522df79ead3f0c1dfed4dcf47774f92e0d94 with merge 0cb6d941828b7099c0e22f0b9976720ce6331621...

[bors]

💔 Test failed - status-travis

[RalfJung]

Oh dang... yeah, combining the PR that fixes miri and another PR that breaks miri by renaming half the things into one leads to trouble.^^

EDIT: Ah, actually the renaming PR landed first, but they were racing in the queue.

[kennytm]

@bors r+

Removed #52338 (miri conflicts with latest master again)
Added #52429, #52286, #52306, #52435.

[bors]

💡 This pull request was already approved, no need to approve it again.

• This pull request previously failed. You should add more commits to fix the bug, or use retry to trigger a build again.
• There's another pull request that is currently being tested, blocking this pull request: rustc: Stabilize the proc_macro feature #52081

[RalfJung]

Somehow this doesn't really seem to be in the queue? Let's see if this works.

@bors retry

[bors]

@RalfJung: 🔑 Insufficient privileges: not in try users

[oli-obk]

@bors r=kennytm

[bors]

📌 Commit 82525123b42cf877d8548fc9c02a68fe61b2c9f3 has been approved by kennytm

[bors]

⌛ Testing commit 82525123b42cf877d8548fc9c02a68fe61b2c9f3 with merge edd38d0814344f5021c91abeef628f8bb02c3c62...

[bors]

💔 Test failed - status-travis

[kennytm]

@bors r+

Removed #52429, #52431 (suspected to cause libcore build failure on PowerPC)
Added #52338, #52434, #52446, #52385

[bors]

📌 Commit 8538063feb4a80b56b8102f87fa0fe98eef83464 has been approved by kennytm

[rust-highfive]

The job x86_64-gnu-llvm-5.0 of your PR failed on Travis (raw log). Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

[00:42:40] ....................................................................................................
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[00:42:51] .......F................F...............i.......................F.....................F.............
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[00:43:29] ................................i...................................................................
[00:43:30] ...................
[00:43:30] failures:
[00:43:30] 
[00:43:30] ---- [ui] ui/issue-14366.rs stdout ----
[00:43:30] diff of stderr:
[00:43:30] 
[00:43:30] 5    |              ^^^^^^ doesn't have a size known at compile-time
[00:43:30] 6    |
[00:43:30] 7    = help: the trait `std::marker::Sized` is not implemented for `str`
[00:43:30] -    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
[00:43:30] +    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>
[00:43:30] 9    = note: required for the cast to the object type `dyn std::any::Any`
[00:43:30] 11 error: aborting due to previous error
[00:43:30] 
[00:43:30] 
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-14366/issue-14366.stderr
[00:43:30] To update references, rerun the tests and pass the `--bless` flag
[00:43:30] To only update this specific test, also pass `--test-args issue-14366.rs`
[00:43:30] error: 1 errors occurred comparing output.
[00:43:30] status: exit code: 101
[00:43:30] status: exit code: 101
[00:43:30] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/issue-14366.rs" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-14366/a" "-Crpath" "-O" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-14366/auxiliary" "-A" "unused"
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] ------------------------------------------
[00:43:30] stderr:
[00:43:30] stderr:
[00:43:30] ------------------------------------------
[00:43:30] {"message":"the size for values of type `str` cannot be known at compilation time","code":{"code":"E0277","explanation":"\nYou tried to use a type which doesn't implement some trait in a place which\nexpected that trait. Erroneous code example:\n\n```compile_fail,E0277\n// here we declare the Foo trait with a bar method\ntrait Foo {\n    fn bar(&self);\n}\n\n// we now declare a function which takes an object implementing the Foo trait\nfn some_func<T: Foo>(foo: T) {\n    foo.bar();\n}\n\nfn main() {\n    // we now call the method with the i32 type, which doesn't implement\n    // the Foo trait\n    some_func(5i32); // error: the trait bound `i32 : Foo` is not satisfied\n}\n```\n\nIn order to fix this error, verify that the type you're using does implement\nthe trait. Example:\n\n```\ntrait Foo {\n    fn bar(&self);\n}\n\nfn some_func<T: Foo>(foo: T) {\n    foo.bar(); // we can now use this method since i32 implements the\n               // Foo trait\n}\n\n// we implement the trait on the i32 type\nimpl Foo for i32 {\n    fn bar(&self) {}\n}\n\nfn main() {\n    some_func(5i32); // ok!\n}\n```\n\nOr in a generic context, an erroneous code example would look like:\n\n```compile_fail,E0277\nfn some_func<T>(foo: T) {\n    println!(\"{:?}\", foo); // error: the trait `core::fmt::Debug` is not\n                           //        implemented for the type `T`\n}\n\nfn main() {\n    // We now call the method with the i32 type,\n    // which *does* implement the Debug trait.\n    some_func(5i32);\n}\n```\n\nNote that the error here is in the definition of the generic function: Although\nwe only call it with a parameter that does implement `Debug`, the compiler\nstill rejects the function: It must work with all possible input types. In\norder to make this example compile, we need to restrict the generic type we're\naccepting:\n\n```\nuse std::fmt;\n\n// Restrict the input type to types that implement Debug.\nfn some_func<T: fmt::Debug>(foo: T) {\n    println!(\"{:?}\", foo);\n}\n\nfn main() {\n    // Calling the method is still fine, as i32 implements Debug.\n    some_func(5i32);\n\n    // This would fail to compile now:\n    // struct WithoutDebug;\n    // some_func(WithoutDebug);\n}\n```\n\nRust only looks at the signature of the called function, as such it must\nalready specify all requirements that will be used for every type parameter.\n"},"level":"error","spans":[{"file_name":"/checkout/src/test/ui/issue-14366.rs","byte_start":492,"byte_end":498,"line_start":12,"line_end":12,"column_start":14,"column_end":20,"is_primary":true,"text":[{"text":"    let _x = \"test\" as &::std::any::Any;","highlight_start":14,"highlight_end":20}],"label":"doesn't have a size known at compile-time","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"the trait `std::marker::Sized` is not implemented for `str`","code":null,"level":"help","spans":[],"children":[],"rendered":null},{"message":"to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"required for the cast to the object type `dyn std::any::Any`","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"error[E0277]: the size for values of type `str` cannot be known at compilation time\n  --> /checkout/src/test/ui/issue-14366.rs:12:14\n   |\nLL |     let _x = \"test\" as &::std::any::Any;\n   |              ^^^^^^ doesn't have a size known at compile-time\n   |\n   = help: the trait `std::marker::Sized` is not implemented for `str`\n   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>\n   = note: required for the cast to the object type `dyn std::any::Any`\n\n"}
[00:43:30] {"message":"aborting due to previous error","code":null,"level":"error","spans":[],"children":[],"rendered":"error: aborting due to previous error\n\n"}
[00:43:30] {"message":"For more information about this error, try `rustc --explain E0277`.","code":null,"level":"","spans":[],"children":[],"rendered":"For more information about this error, try `rustc --explain E0277`.\n"}
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] thread '[ui] ui/issue-14366.rs' panicked at 'explicit panic', tools/compiletest/src/runtest.rs:3139:9
[00:43:30] note: Run with `RUST_BACKTRACE=1` for a backtrace.
[00:43:30] note: Run with `RUST_BACKTRACE=1` for a backtrace.
[00:43:30] 
[00:43:30] ---- [ui] ui/issue-15756.rs stdout ----
[00:43:30] diff of stderr:
[00:43:30] 
[00:43:30] 5    |          ^^^^^^^^^ doesn't have a size known at compile-time
[00:43:30] 6    |
[00:43:30] 7    = help: the trait `std::marker::Sized` is not implemented for `[T]`
[00:43:30] -    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
[00:43:30] +    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>
[00:43:30] 9    = note: all local variables must have a statically known size
[00:43:30] 11 error: aborting due to previous error
[00:43:30] 
[00:43:30] 
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-15756/issue-15756.stderr
[00:43:30] To update references, rerun the tests and pass the `--bless` flag
[00:43:30] To only update this specific test, also pass `--test-args issue-15756.rs`
[00:43:30] error: 1 errors occurred comparing output.
[00:43:30] status: exit code: 101
[00:43:30] status: exit code: 101
[00:43:30] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/issue-15756.rs" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-15756/a" "-Crpath" "-O" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-15756/auxiliary" "-A" "unused"
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] ------------------------------------------
[00:43:30] stderr:
[00:43:30] stderr:
[00:43:30] ------------------------------------------
[00:43:30] {"message":"the size for values of type `[T]` cannot be known at compilation time","code":{"code":"E0277","explanation":"\nYou tried to use a type which doesn't implement some trait in a place which\nexpected that trait. Erroneous code example:\n\n```compile_fail,E0277\n// here we declare the Foo trait with a bar method\ntrait Foo {\n    fn bar(&self);\n}\n\n// we now declare a function which takes an object implementing the Foo trait\nfn some_func<T: Foo>(foo: T) {\n    foo.bar();\n}\n\nfn main() {\n    // we now call the method with the i32 type, which doesn't implement\n    // the Foo trait\n    some_func(5i32); // error: the trait bound `i32 : Foo` is not satisfied\n}\n```\n\nIn order to fix this error, verify that the type you're using does implement\nthe trait. Example:\n\n```\ntrait Foo {\n    fn bar(&self);\n}\n\nfn some_func<T: Foo>(foo: T) {\n    foo.bar(); // we can now use this method since i32 implements the\n               // Foo trait\n}\n\n// we implement the trait on the i32 type\nimpl Foo for i32 {\n    fn bar(&self) {}\n}\n\nfn main() {\n    some_func(5i32); // ok!\n}\n```\n\nOr in a generic context, an erroneous code example would look like:\n\n```compile_fail,E0277\nfn some_func<T>(foo: T) {\n    println!(\"{:?}\", foo); // error: the trait `core::fmt::Debug` is not\n                           //        implemented for the type `T`\n}\n\nfn main() {\n    // We now call the method with the i32 type,\n    // which *does* implement the Debug trait.\n    some_func(5i32);\n}\n```\n\nNote that the error here is in the definition of the generic function: Although\nwe only call it with a parameter that does implement `Debug`, the compiler\nstill rejects the function: It must work with all possible input types. In\norder to make this example compile, we need to restrict the generic type we're\naccepting:\n\n```\nuse std::fmt;\n\n// Restrict the input type to types that implement Debug.\nfn some_func<T: fmt::Debug>(foo: T) {\n    println!(\"{:?}\", foo);\n}\n\nfn main() {\n    // Calling the method is still fine, as i32 implements Debug.\n    some_func(5i32);\n\n    // This would fail to compile now:\n    // struct WithoutDebug;\n    // some_func(WithoutDebug);\n}\n```\n\nRust only looks at the signature of the called function, as such it must\nalready specify all requirements that will be used for every type parameter.\n"},"level":"error","spans":[{"file_name":"/checkout/src/test/ui/issue-15756.rs","byte_start":600,"byte_end":609,"line_start":17,"line_end":17,"column_start":10,"column_end":19,"is_primary":true,"text":[{"text":"    &mut something","highlight_start":10,"highlight_end":19}],"label":"doesn't have a size known at compile-time","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"the trait `std::marker::Sized` is not implemented for `[T]`","code":null,"level":"help","spans":[],"children":[],"rendered":null},{"message":"to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"all local variables must have a statically known size","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"error[E0277]: the size for values of type `[T]` cannot be known at compilation time\n  --> /checkout/src/test/ui/issue-15756.rs:17:10\n   |\nLL |     &mut something\n   |          ^^^^^^^^^ doesn't have a size known at compile-time\n   |\n   = help: the trait `std::marker::Sized` is not implemented for `[T]`\n   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>\n   = note: all local variables must have a statically known size\n\n"}
[00:43:30] {"message":"aborting due to previous error","code":null,"level":"error","spans":[],"children":[],"rendered":"error: aborting due to previous error\n\n"}
[00:43:30] {"message":"For more information about this error, try `rustc --explain E0277`.","code":null,"level":"","spans":[],"children":[],"rendered":"For more information about this error, try `rustc --explain E0277`.\n"}
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] thread '[ui] ui/issue-15756.rs' panicked at 'explicit panic', tools/compiletest/src/runtest.rs:3139:9
[00:43:30] 
[00:43:30] 
[00:43:30] ---- [ui] ui/issue-17651.rs stdout ----
[00:43:30] diff of stderr:
[00:43:30] 
[00:43:30] 5    |         ^^^^^^^^ doesn't have a size known at compile-time
[00:43:30] 6    |
[00:43:30] 7    = help: the trait `std::marker::Sized` is not implemented for `[{integer}]`
[00:43:30] -    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
[00:43:30] +    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>
[00:43:30] 9    = note: required by `<std::boxed::Box<T>>::new`
[00:43:30] 11 error: aborting due to previous error
[00:43:30] 
[00:43:30] 
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-17651/issue-17651.stderr
[00:43:30] To update references, rerun the tests and pass the `--bless` flag
[00:43:30] To only update this specific test, also pass `--test-args issue-17651.rs`
[00:43:30] error: 1 errors occurred comparing output.
[00:43:30] status: exit code: 101
[00:43:30] status: exit code: 101
[00:43:30] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/issue-17651.rs" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-17651/a" "-Crpath" "-O" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-17651/auxiliary" "-A" "unused"
[00:43:30] stdout:
[0ype,\n    // which *does* implement the Debug trait.\n    some_func(5i32);\n}\n```\n\nNote that the error here is in the definition of the generic function: Although\nwe only call it with a parameter that does implement `Debug`, the compiler\nstill rejects the function: It must work with all possible input types. In\norder to make this example compile, we need to restrict the generic type we're\naccepting:\n\n```\nuse std::fmt;\n\n// Restrict the input type to types that implement Debug.\nfn some_func<T: fmt::Debug>(foo: T) {\n    println!(\"{:?}\", foo);\n}\n\nfn main() {\n    // Calling the method is still fine, as i32 implements Debug.\n    some_func(5i32);\n\n    // This would fail to compile now:\n    // struct WithoutDebug;\n    // some_func(WithoutDebug);\n}\n```\n\nRust only looks at the signature of the called function, as such it must\nalready specify all requirements that will be used for every type parameter.\n"},"level":"error","spans":[{"file_name":"/checkout/src/test/ui/issue-17651.rs","byte_start":569,"byte_end":577,"line_start":15,"line_end":15,"column_start":9,"column_end":17,"is_primary":true,"text":[{"text":"    (|| Box::new(*(&[0][..])))();","highlight_start":9,"highlight_end":17}],"label":"doesn't have a size known at compile-time","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"the trait `std::marker::Sized` is not implemented for `[{integer}]`","code":null,"level":"help","spans":[],"children":[],"rendered":null},{"message":"to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"required by `<std::boxed::Box<T>>::new`","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"error[E0277]: the size for values of type `[{integer}]` cannot be known at compilation time\n  --> /checkout/src/test/ui/issue-17651.rs:15:9\n   |\nLL |     (|| Box::new(*(&[0][..])))();\n   |         ^^^^^^^^ doesn't have a size known at compile-time\n   |\n   = help: the trait `std::marker::Sized` is not implemented for `[{integer}]`\n   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>\n   = note: required by `<std::boxed::Box<T>>::new`\n\n"}
[00:43:30] {"message":"aborting due to previous error","code":null,"level":"error","spans":[],"children":[],"rendered":"error: aborting due to previous error\n\n"}
[00:43:30] {"message":"For more information about this error, try `rustc --explain E0277`.","code":null,"level":"","spans":[],"children":[],"rendered":"For more information about this error, try `rustc --explain E0277`.\n"}
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] thread '[ui] ui/issue-17651.rs' panicked at 'explicit panic', tools/compiletest/src/runtest.rs:3139:9
[00:43:30] 
[00:43:30] 
[00:43:30] ---- [ui] ui/issue-18107.rs stdout ----
[00:43:30] diff of stderr:
[00:43:30] 
[00:43:30] 5    |     ^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
[00:43:30] 6    |
[00:43:30] 7    = help: the trait `std::marker::Sized` is not implemented for `(dyn AbstractRenderer + 'static)`
[00:43:30] -    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
[00:43:30] +    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>
[00:43:30] 9    = note: the return type of a function must have a statically known size
[00:43:30] 11 error: aborting due to previous error
[00:43:30] 
[00:43:30] 
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-18107/issue-18107.stderr
[00:43:30] To update references, rerun the tests and pass the `--bless` flag
[00:43:30] To only update this specific test, also pass `--test-args issue-18107.rs`
[00:43:30] error: 1 errors occurred comparing output.
[00:43:30] status: exit code: 101
[00:43:30] status: exit code: 101
[00:43:30] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/issue-18107.rs" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-18107/a" "-Crpath" "-O" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-18107/auxiliary" "-A" "unused"
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] ------------------------------------------
[00:43:30] stderr:
[00:43:30] stderr:
[00:43:30] ------------------------------------------
[00:43:30] {"message":"the size for values of type `(dyn AbstractRenderer + 'static)` cannot be known at compilation time","code":{"code":"E0277","explanation":"\nYou tried to use a type which doesn't implement some trait in a place which\nexpected that trait. Erroneous code example:\n\n```compile_fail,E0277\n// here we declare the Foo trait with a bar method\ntrait Foo {\n    fn bar(&self);\n}\n\n// we now declare a function which takes an object implementing the Foo trait\nfn some_func<T: Foo>(foo: T) {\n    foo.bar();\n}\n\nfn main() {\n    // we now call the method with the i32 type, which doesn't implement\n    // the Foo trait\n    some_func(5i32); // error: the trait bound `i32 : Foo` is not satisfied\n}\n```\n\nIn order to fix this error, verify that the type you're using does implement\nthe trait. Example:\n\n```\ntrait Foo {\n    fn bar(&self);\n}\n\nfn some_func<T: Foo>(foo: T) {\n    foo.bar(); // we can now use this method since i32 implements the\n               // Foo trait\n}\n\n// we implement the trait on the i32 type\nimpl Foo for i32 {\n    fn bar(&self) {}\n}\n\nfn main() {\n    some_func(5i32); // ok!\n}\n```\n\nOr in a generic context, an erroneous code example would look like:\n\n```compile_fail,E0277\nfn some_func<T>(foo: T) {\n    println!(\"{:?}\", foo); // error: the trait `core::fmt::Debug` is not\n                           //        implemented for the type `T`\n}\n\nfn main() {\n    // We now call the method with the i32 type,\n    // which *does* implement the Debug trait.\n    some_func(5i32);\n}\n```\n\nNote that the error here is in the definition of the generic function: Although\nwe only call it with a parameter that does implement `Debug`, the compiler\nstill rejects the function: It must work with all possible input types. In\norder to make this example compile, we need to restrict the generic type we're\naccepting:\n\n```\nuse std::fmt;\n\n// Restrict the input type to types that implement Debug.\nfn some_func<T: fmt::Debug>(foo: T) {\n    println!(\"{:?}\", foo);\n}\n\nfn main() {\n    // Calling the method is still fine, as i32 implements Debug.\n    some_func(5i32);\n\n    // This would fail to compile now:\n    // struct WithoutDebug;\n    // some_func(WithoutDebug);\n}\n```\n\nRust only looks at the signature of the called function, as such it must\nalready specify all requirements that will be used for every type parameter.\n"},"level":"error","spans":[{"file_name":"/checkout/src/test/ui/issue-18107.rs","byte_start":531,"byte_end":547,"line_start":14,"line_end":14,"column_start":5,"column_end":21,"is_primary":true,"text":[{"text":"    AbstractRenderer","highlight_start":5,"highlight_end":21}],"label":"doesn't have a size known at compile-time","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"the trait `std::marker::Sized` is not implemented for `(dyn AbstractRenderer + 'static)`","code":null,"level":"help","spans":[],"children":[],"rendered":null},{"message":"to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"the return type of a function must have a statically known size","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"error[E0277]: the size for values of type `(dyn AbstractRenderer + 'static)` cannot be known at compilation time\n  --> /checkout/src/test/ui/issue-18107.rs:14:5\n   |\nLL |     AbstractRenderer\n   |     ^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time\n   |\n   = help: the trait `std::marker::Sized` is not implemented for `(dyn AbstractRenderer + 'static)`\n   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>\n   = note: the return type of a function must have a statically known size\n\n"}
[00:43:30] {"message":"aborting due to previous error","code":null,"level":"error","spans":[],"children":[],"rendered":"error: aborting due to previous error\n\n"}
[00:43:30] {"message":"For more information about this error, try `rustc --explain E0277`.","code":null,"level":"","spans":[],"children":[],"rendered":"For more information about this error, try `rustc --explain E0277`.\n"}
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] thread '[ui] ui/issue-18107.rs' panicked at 'explicit panic', tools/compiletest/src/runtest.rs:3139:9
[00:43:30] 
[00:43:30] 
[00:43:30] ---- [ui] ui/issue-18919.rs stdout ----
[00:43:30] diff of stderr:
[00:43:30] 
[00:43:30] 7    | |_^ doesn't have a size known at compile-time
[00:43:30] 8    |
[00:43:30] 9    = help: the trait `std::marker::Sized` is not implemented for `dyn for<'r> std::ops::Fn(&'r isize) -> isize`
[00:43:30] -    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
[00:43:30] +    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>
[00:43:30] 11    = note: required by `std::option::Option`
[00:43:30] 13 error: aborting due to previous error
[00:43:30] 
[00:43:30] 
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-18919/issue-18919.stderr
[00:43:30] To update references, rerun the tests and pass the `--bless` flag
[00:43:30] To only update this specific test, also pass `--test-args issue-18919.rs`
[00:43:30] error: 1 errors occurred comparing output.
[00:43:30] status: exit code: 101
[00:43:30] status: exit code: 101
[00:43:30] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/issue-18919.rs" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-18919/a" "-Crpath" "-O" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-18919/auxiliary" "-A" "unused"
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] ------------------------------------------
[00:43:30] stderr:
[00:43:30] stderr:
[00:43:30] ------------------------------------------
[00:43:30] {"message":"the size for values of type `dyn for<'r> std::ops::Fn(&\nstill rejects the function: It must work with all possible input types. In\norder to make this example compile, we need to restrict the generic type we're\naccepting:\n\n```\nuse std::fmt;\n\n// Restrict the input type to types that implement Debug.\nfn some_func<T: fmt::Debug>(foo: T) {\n    println!(\"{:?}\", foo);\n}\n\nfn main() {\n    // Calling the method is still fine, as i32 implements Debug.\n    some_func(5i32);\n\n    // This would fail to compile now:\n    // struct WithoutDebug;\n    // some_func(WithoutDebug);\n}\n```\n\nRust only looks at the signature of the called function, as such it must\nalready specify all requirements that will be used for every type parameter.\n"},"level":"error","spans":[{"file_name":"/checkout/src/test/ui/issue-18919.rs","byte_start":514,"byte_end":592,"line_start":13,"line_end":15,"column_start":1,"column_end":2,"is_primary":true,"text":[{"text":"fn ho_func(f: Option<FuncType>) {","highlight_start":1,"highlight_end":34},{"text":"    //~^ ERROR the size for values of type","highlight_start":1,"highlight_end":43},{"text":"}","highlight_start":1,"highlight_end":2}],"label":"doesn't have a size known at compile-time","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"the trait `std::marker::Sized` is not implemented for `dyn for<'r> std::ops::Fn(&'r isize) -> isize`","code":null,"level":"help","spans":[],"children":[],"rendered":null},{"message":"to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"required by `std::option::Option`","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"error[E0277]: the size for values of type `dyn for<'r> std::ops::Fn(&'r isize) -> isize` cannot be known at compilation time\n  --> /checkout/src/test/ui/issue-18919.rs:13:1\n   |\nLL | / fn ho_func(f: Option<FuncType>) {\nLL | |     //~^ ERROR the size for values of type\nLL | | }\n   | |_^ doesn't have a size known at compile-time\n   |\n   = help: the trait `std::marker::Sized` is not implemented for `dyn for<'r> std::ops::Fn(&'r isize) -> isize`\n   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>\n   = note: required by `std::option::Option`\n\n"}
[00:43:30] {"message":"aborting due to previous error","code":null,"level":"error","spans":[],"children":[],"rendered":"error: aborting due to previous error\n\n"}
[00:43:30] {"message":"For more information about this error, try `rustc --explain E0277`.","code":null,"level":"","spans":[],"children":[],"rendered":"For more information about this error, try `rustc --explain E0277`.\n"}
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] thread '[ui] ui/issue-18919.rs' panicked at 'explicit panic', tools/compiletest/src/runtest.rs:3139:9
[00:43:30] 
[00:43:30] 
[00:43:30] ---- [ui] ui/issue-20005.rs stdout ----
[00:43:30] diff of stderr:
[00:43:30] 
[00:43:30] 9    | |_____^ doesn't have a size known at compile-time
[00:43:30] 11    = help: the trait `std::marker::Sized` is not implemented for `Self`
[00:43:30] 11    = help: the trait `std::marker::Sized` is not implemented for `Self`
[00:43:30] -    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
[00:43:30] +    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>
[00:43:30] 13    = help: consider adding a `where Self: std::marker::Sized` bound
[00:43:30] 14 note: required by `From`
[00:43:30] 
[00:43:30] 
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-20005/issue-20005.stderr
[00:43:30] Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-20005/issue-20005.stderr
[00:43:30] To update references, rerun the tests and pass the `--bless` flag
[00:43:30] To only update this specific test, also pass `--test-args issue-20005.rs`
[00:43:30] error: 1 errors occurred comparing output.
[00:43:30] status: exit code: 101
[00:43:30] status: exit code: 101
[00:43:30] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/issue-20005.rs" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-20005/a" "-Crpath" "-O" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-20005/auxiliary" "-A" "unused"
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] ------------------------------------------
[00:43:30] stderr:
[00:43:30] stderr:
[00:43:30] ------------------------------------------
[00:43:30] {"message":"the size for values of type `Self` cannot be known at compilation time","code":{"code":"E0277","explanation":"\nYou tried to use a type which doesn't implement some trait in a place which\nexpected that trait. Erroneous code example:\n\n```compile_fail,E0277\n// here we declare the Foo trait with a bar method\ntrait Foo {\n    fn bar(&self);\n}\n\n// we now declare a function which takes an object implementing the Foo trait\nfn some_func<T: Foo>(foo: T) {\n    foo.bar();\n}\n\nfn main() {\n    // we now call the method with the i32 type, which doesn't implement\n    // the Foo trait\n    some_func(5i32); // error: the trait bound `i32 : Foo` is not satisfied\n}\n```\n\nIn order to fix this error, verify that the type you're using does implement\nthe trait. Example:\n\n```\ntrait Foo {\n    fn bar(&self);\n}\n\nfn some_func<T: Foo>(foo: T) {\n    foo.bar(); // we can now use this method since i32 implements the\n               // Foo trait\n}\n\n// we implement the trait on the i32 type\nimpl Foo for i32 {\n    fn bar(&self) {}\n}\n\nfn main() {\n    some_func(5i32); // ok!\n}\n```\n\nOr in a generic context, an erroneous code example would look like:\n\n```compile_fail,E0277\nfn some_func<T>(foo: T) {\n    println!(\"{:?}\", foo); // error: the trait `core::fmt::Debug` is not\n                           //        implemented for the type `T`\n}\n\nfn main() {\n    // We now call the method with the i32 type,\n    // which *does* implement the Debug trait.\n    some_func(5i32);\n}\n```\n\nNote that the error here is in the definition of the generic function: Although\nwe only call it with a parameter that does implement `Debug`, the compiler\nstill rejects the function: It must work with all possible input types. In\norder to make this example compile, we need to restrict the generic type we're\naccepting:\n\n```\nuse std::fmt;\n\n// Restrict the input type to types that implement Debug.\nfn some_func<T: fmt::Debug>(foo: T) {\n    println!(\"{:?}\", foo);\n}\n\nfn main() {\n    // Calling the method is still fine, as i32 implements Debug.\n    some_func(5i32);\n\n    // This would fail to compile now:\n    // struct WithoutDebug;\n    // some_func(WithoutDebug);\n}\n```\n\nRust only looks at the signature of the called function, as such it must\nalready specify all requirements that will be used for every type parameter.\n"},"level":"error","spans":[{"file_name":"/checkout/src/test/ui/issue-20005.rs","byte_start":560,"byte_end":715,"line_start":18,"line_end":22,"column_start":5,"column_end":6,"is_primary":true,"text":[{"text":"    fn to<Dst>(  //~ ERROR the size for values of type","highlight_start":5,"highlight_end":55},{"text":"        self","highlight_start":1,"highlight_end":13},{"text":"    ) -> <Dst as From<Self>>::Result where Dst: From<Self> {","highlight_start":1,"highlight_end":61},{"text":"        From::from(self)","highlight_start":1,"highlight_end":25},{"text":"    }","highlight_start":1,"highlight_end":6}],"label":"doesn't have a size known at compile-time","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"the trait `std::marker::Sized` is not implemented for `Self`","code":null,"level":"help","spans":[],"children":[],"rendered":null},{"message":"to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"consider adding a `where Self: std::marker::Sized` bound","code":null,"level":"help","spans":[],"children":[],"rendered":null},{"message":"required by `From`","code":null,"level":"note","spans":[{"file_name":"/checkout/src/test/ui/issue-20005.rs","byte_start":467,"byte_end":482,"line_start":11,"line_end":11,"column_start":1,"column_end":16,"is_primary":true,"text":[{"text":"trait From<Src> {","highlight_start":1,"highlight_end":16}],"label":null,"suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[],"rendered":null}],"rendered":"error[E0277]: the size for values of type `Self` cannot be known at compilation time\n  --> /checkout/src/test/ui/issue-20005.rs:18:5\n   |\nLL | /     fn to<Dst>(  //~ ERROR the size for values of type\nLL | |         self\nLL | |     ) -> <Dst as From<Self>>::Result where Dst: From<Self> {\nLL | |         From::from(self)\nLL | |     }\n   | |_____^ doesn't have a size known at compile-time\n   |\n   = help: the trait `std::marker::Sized` is not implemented for `Self`\n   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>\n   = help: consider adding a `where Self: std::marker::Sized` bound\nnote: required by `From`\n  --> /checkout/src/test/ui/issue-20005.rs:11:1\n   |\nLL | trait From<Src> {\n   | ^^^^^^^^^^^^^^^\n\n"}
[00:43:30] {"message":"aborting due to previous error","code":null,"level":"error","spans":[],"children":[],"rendered":"error: aborting due to previous error\n\n"}
[00:43:30] {"message":"For more information about this error, try `rustc --explain E0277`.","code":null,"level":"","spans":[],"children":[],"rendered":"For more information about this error, try `rustc --explain E0277`.\n"}
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] thread '[ui] ui/issue-20005.rs' panicked at 'explicit panic', tools/compiletest/src/runtest.rs:3139:9
[00:43:30] 
[00:43:30] 
[00:43:30] ---- [ui] ui/issue-20433.rs stdout ----
[00:43:30] diff of stderr:
[00:43:30] 
[00:43:30] 5    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
[00:43:30] 7    = help: the trait `std::marker::Sized` is not implemented for `[i32]`
[00:43:30] 7    = help: the trait `std::marker::Sized` is not implemented for `[i32]`
[00:43:30] -    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
[00:43:30] +    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>
[00:43:30] 9    = note: required by `std::vec::Vec`
[00:43:30] 11 error: aborting due to previous error
[00:43:30] 
[00:43:30] 
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-20433/issue-20433.stderr
[00:43:30] To update references, rerun the tests and pass the `--bless` flag
[00:43:30] To only update this specific test, also pass `--test-args\ntrait Foo {\n    fn bar(&self);\n}\n\nfn some_func<T: Foo>(foo: T) {\n    foo.bar(); // we can now use this method since i32 implements the\n               // Foo trait\n}\n\n// we implement the trait on the i32 type\nimpl Foo for i32 {\n    fn bar(&self) {}\n}\n\nfn main() {\n    some_func(5i32); // ok!\n}\n```\n\nOr in a generic context, an erroneous code example would look like:\n\n```compile_fail,E0277\nfn some_func<T>(foo: T) {\n    println!(\"{:?}\", foo); // error: the trait `core::fmt::Debug` is not\n                           //        implemented for the type `T`\n}\n\nfn main() {\n    // We now call the method with the i32 type,\n    // which *does* implement the Debug trait.\n    some_func(5i32);\n}\n```\n\nNote that the error here is in the definition of the generic function: Although\nwe only call it with a parameter that does implement `Debug`, the compiler\nstill rejects the function: It must work with all possible input types. In\norder to make this example compile, we need to restrict the generic type we're\naccepting:\n\n```\nuse std::fmt;\n\n// Restrict the input type to types that implement Debug.\nfn some_func<T: fmt::Debug>(foo: T) {\n    println!(\"{:?}\", foo);\n}\n\nfn main() {\n    // Calling the method is still fine, as i32 implements Debug.\n    some_func(5i32);\n\n    // This would fail to compile now:\n    // struct WithoutDebug;\n    // some_func(WithoutDebug);\n}\n```\n\nRust only looks at the signature of the called function, as such it must\nalready specify all requirements that will be used for every type parameter.\n"},"level":"error","spans":[{"file_name":"/checkout/src/test/ui/issue-20433.rs","byte_start":509,"byte_end":536,"line_start":16,"line_end":16,"column_start":5,"column_end":32,"is_primary":true,"text":[{"text":"    fn iceman(c: Vec<[i32]>) {}","highlight_start":5,"highlight_end":32}],"label":"doesn't have a size known at compile-time","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"the trait `std::marker::Sized` is not implemented for `[i32]`","code":null,"level":"help","spans":[],"children":[],"rendered":null},{"message":"to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"required by `std::vec::Vec`","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"error[E0277]: the size for values of type `[i32]` cannot be known at compilation time\n  --> /checkout/src/test/ui/issue-20433.rs:16:5\n   |\nLL |     fn iceman(c: Vec<[i32]>) {}\n   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time\n   |\n   = help: the trait `std::marker::Sized` is not implemented for `[i32]`\n   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>\n   = note: required by `std::vec::Vec`\n\n"}
[00:43:30] {"message":"aborting due to previous error","code":null,"level":"error","spans":[],"children":[],"rendered":"error: aborting due to previous error\n\n"}
[00:43:30] {"message":"For more information about this error, try `rustc --explain E0277`.","code":null,"level":"","spans":[],"children":[],"rendered":"For more information about this error, try `rustc --explain E0277`.\n"}
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] thread '[ui] ui/issue-20433.rs' panicked at 'explicit panic', tools/compiletest/src/runtest.rs:3139:9
[00:43:30] 
[00:43:30] 
[00:43:30] ---- [ui] ui/issue-20605.rs stdout ----
[00:43:30] diff of stderr:
[00:43:30] 
[00:43:30] 5    |                 ^^^^^^^ doesn't have a size known at compile-time
[00:43:30] 6    |
[00:43:30] 7    = help: the trait `std::marker::Sized` is not implemented for `dyn std::iter::Iterator<Item=&mut u8>`
[00:43:30] -    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
[00:43:30] +    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>
[00:43:30] 9    = note: required by `std::iter::IntoIterator::into_iter`
[00:43:30] 11 error: aborting due to previous error
[00:43:30] 
[00:43:30] 
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-20605/issue-20605.stderr
[00:43:30] To update references, rerun the tests and pass the `--bless` flag
[00:43:30] To only update this specific test, also pass `--test-args issue-20605.rs`
[00:43:30] error: 1 errors occurred comparing output.
[00:43:30] status: exit code: 101
[00:43:30] status: exit code: 101
[00:43:30] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/issue-20605.rs" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-20605/a" "-Crpath" "-O" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-20605/auxiliary" "-A" "unused"
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] ------------------------------------------
[00:43:30] stderr:
[00:43:30] stderr:
[00:43:30] ------------------------------------------
[00:43:30] {"message":"the size for values of type `dyn std::iter::Iterator<Item=&mut u8>` cannot be known at compilation time","code":{"code":"E0277","explanation":"\nYou tried to use a type which doesn't implement some trait in a place which\nexpected that trait. Erroneous code example:\n\n```compile_fail,E0277\n// here we declare the Foo trait with a bar method\ntrait Foo {\n    fn bar(&self);\n}\n\n// we now declare a function which takes an object implementing the Foo trait\nfn some_func<T: Foo>(foo: T) {\n    foo.bar();\n}\n\nfn main() {\n    // we now call the method with the i32 type, which doesn't implement\n    // the Foo trait\n    some_func(5i32); // error: the trait bound `i32 : Foo` is not satisfied\n}\n```\n\nIn order to fix this error, verify that the type you're using does implement\nthe trait. Example:\n\n```\ntrait Foo {\n    fn bar(&self);\n}\n\nfn some_func<T: Foo>(foo: T) {\n    foo.bar(); // we can now use this method since i32 implements the\n               // Foo trait\n}\n\n// we implement the trait on the i32 type\nimpl Foo for i32 {\n    fn bar(&self) {}\n}\n\nfn main() {\n    some_func(5i32); // ok!\n}\n```\n\nOr in a generic context, an erroneous code example would look like:\n\n```compile_fail,E0277\nfn some_func<T>(foo: T) {\n    println!(\"{:?}\", foo); // error: the trait `core::fmt::Debug` is not\n                           //        implemented for the type `T`\n}\n\nfn main() {\n    // We now call the method with the i32 type,\n    // which *does* implement the Debug trait.\n    some_func(5i32);\n}\n```\n\nNote that the error here is in the definition of the generic function: Although\nwe only call it with a parameter that does implement `Debug`, the compiler\nstill rejects the function: It must work with all possible input types. In\norder to make this example compile, we need to restrict the generic type we're\naccepting:\n\n```\nuse std::fmt;\n\n// Restrict the input type to types that implement Debug.\nfn some_func<T: fmt::Debug>(foo: T) {\n    println!(\"{:?}\", foo);\n}\n\nfn main() {\n    // Calling the method is still fine, as i32 implements Debug.\n    some_func(5i32);\n\n    // This would fail to compile now:\n    // struct WithoutDebug;\n    // some_func(WithoutDebug);\n}\n```\n\nRust only looks at the signature of the called function, as such it must\nalready specify all requirements that will be used for every type parameter.\n"},"level":"error","spans":[{"file_name":"/checkout/src/test/ui/issue-20605.rs","byte_start":544,"byte_end":551,"line_start":12,"line_end":12,"column_start":17,"column_end":24,"is_primary":true,"text":[{"text":"    for item in *things { *item = 0 }","highlight_start":17,"highlight_end":24}],"label":"doesn't have a size known at compile-time","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"the trait `std::marker::Sized` is not implemented for `dyn std::iter::Iterator<Item=&mut u8>`","code":null,"level":"help","spans":[],"children":[],"rendered":null},{"message":"to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"required by `std::iter::IntoIterator::into_iter`","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"error[E0277]: the size for values of type `dyn std::iter::Iterator<Item=&mut u8>` cannot be known at compilation time\n  --> /checkout/src/test/ui/issue-20605.rs:12:17\n   |\nLL |     for item in *things { *item = 0 }\n   |                 ^^^^^^^ doesn't have a size known at compile-time\n   |\n   = help: the trait `std::marker::Sized` is not implemented for `dyn std::iter::Iterator<Item=&mut u8>`\n   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>\n   = note: required by `std::iter::IntoIterator::into_iter`\n\n"}
[00:43:30] {"message":"aborting due to previous error","code":null,"level":"error","spans":[],"children":[],"rendered":"error: aborting due to previous error\n\n"}
[00:43:30] {"message":"For more information about this error, try `rustc --explain E0277`.","code":null,"level":"","spans":[],"children":[],"rendered":"For more information about this error, try `rustc --explain E0277`.\n"}
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] thread '[ui] ui/issue-20605.rs' panicked at 'explicit panic', tools/compiletest/src/runtest.rs:3139:9
[00:43:30] 
[00:43:30] 
[00:43:30] ---- [ui] ui/issue-22874.rs stdout ----
[00:43:30] diff of stderr:
[00:43:30] 
[00:43:30] 5    |     ^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
[00:43:30] 6    |
[00:43:30] 7    = help: the trait `std::marker::Sized` is not implemented for `[std::string::String]`
[00:43:30] -    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
[00:43:30] +    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>
[00:43:30] 9    = note: slice and array elements must have `Sized` type
[00:43:30] 11 error: aborting due to previous error
[00:43:30] 
[00:43:30] 
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-22874/issue-22874.stderr
[00:43:30] To update references, rerun the tests and pass the `--bless` flag
[00:43:30] To only update this specific test, also pass `--test-args issue-22874.rs`
[00:43:30] error: 1 errors occurred comparing output.
[00:43:30] status: exit code: 101
[00:43:30] status: exit code: 101
[00:43:30] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/issue-22874.rs" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-22874/a" "-Crpath" "-O" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-22874/auxiliary" "-A" "unused"
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] ------------------------------------------
[00:43:30] stderr:
[00:43:30] stderr:
[00:43:30] ------------------------------------------
[00:43:30] {"message":"the size for values of type `[std::string::String]` cannot be known at compilation time","code":{"code":"E0277","explanation":"\nYou tried to use a type which doesn't implement some trait in a place which\nexpected that trait. Erroneous code example:\n\n```compile_fail,E0277\n// here we declare the Foo trait with a bar method\ntrait Foo {\n    fn bar(&self);\n}\n\n// we now declare a function which takes an object implementing the Foo trait\nfn some_func<T: Foo>(foo: T) {\n    foo.bar();\n}\n\nfn main() {\n    // we now call the method with the i32 type, which doesn't implement\n    // the Foo trait\n    some_func(5i32); // error: the trait bound `i32 : Foo` is not satisfied\n}\n```\n\nIn order to fix this error, verify that the type you're using does implement\nthe trait. Example:\n\n```\ntrait Foo {\n    fn bar(&self);\n}\n\nfn some_func<T: Foo>(foo: T) {\n    foo.bar(); // we can now use this method since i32 implements the\n               // Foo trait\n}\n\n// we implement the trait on the i32 type\nimpl Foo for i32 {\n    fn bar(&self) {}\n}\n\nfn main() {\n    some_func(5i32); // ok!\n}\n```\n\nOr in a generic context, an erroneous code example would look like:\n\n```compile_fail,E0277\nfn some_func<T>(foo: T) {\n    println!(\"{:?}\", foo); // error: the trait `core::fmt::Debug` is not\n                           //        implemented for the type `T`\n}\n\nfn main() {\n    // We now call the method with the i32 type,\n    // which *does* implement the Debug trait.\n    some_func(5i32);\n}\n```\n\nNote that the error here is in the definition of the generic function: Although\nwe only call it with a parameter that does implement `Debug`, the compiler\nstill rejects the function: It must work with all possible input types. In\norder to make this example compile, we need to restrict the generic type we're\naccepting:\n\n```\nuse std::fmt;\n\n// Restrict the input type to types that implement Debug.\nfn some_func<T: fmt::Debug>(foo: T) {\n    println!(\"{:?}\", foo);\n}\n\nfn main() {\n    // Calling the method is still fine, as i32 implements Debug.\n    some_func(5i32);\n\n    // This would fail to compile now:\n    // struct WithoutDebug;\n    // some_func(WithoutDebug);\n}\n```\n\nRust only looks at the signature of the called function, as such it must\nalready specify all requirements that will be used for every type parameter.\n"},"level":"error","spans":[{"file_name":"/checkout/src/test/ui/issue-22874.rs","byte_start":486,"byte_end":502,"line_start":12,"line_end":12,"column_start":5,"column_end":21,"is_primary":true,"text":[{"text":"    rows: [[String]],","highlight_start":5,"highlight_end":21}],"label":"doesn't have a size known at compile-time","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"the trait `std::marker::Sized` is not implemented for `[std::string::String]`","code":null,"level":"help","spans":[],"children":[],"rendered":null},{"message":"to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"slice and array elements must have `Sized` type","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"error[E0277]: the size for values of type `[std::string::String]` cannot be known at compilation time\n  --> /checkout/src/test/ui/issue-22874.rs:12:5\n   |\nLL |     rows: [[String]],\n   |     ^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time\n   |\n   = help: the trait `std::marker::Sized` is not implemented for `[std::string::String]`\n   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>\n   = note: slice and array elements must have `Sized` type\n\n"}
[00:43:30] {"message":"aborting due to previous error","code":null,"level":"error","spans":[],"children":[],"rendered":"error: aborting due to previous error\n\n"}
[00:43:30] {"message":"For more information about this error, try `rustc --explain E0277`.","code":null,"level":"","spans":[],"children":[],"rendered":"For more information about this error, try `rustc --explain E0277`.\n"}
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] thread '[ui] ui/issue-22874.rs' panicked at 'explicit panic', tools/compiletest/src/runtest.rs:3139:9
[00:43:30] 
[00:43:30] 
[00:43:30] ---- [ui] ui/issue-23281.rs stdout ----
[00:43:30] diff of stderr:
[00:43:30] 
[00:43:30] 5    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
[00:43:30] 6    |
[00:43:30] 7    = help: the trait `std::marker::Sized` is not implemented for `(dyn std::ops::Fn() + 'static)`
[00:43:30] -    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
[00:43:30] +    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>
[00:43:30] 9    = note: required by `std::vec::Vec`
[00:43:30] 11 error: aborting due to previous error
[00:43:30] 
[00:43:30] 
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-23281/issue-23281.stderr
[00:43:30] To update references, rerun the tests and pass the `--bless` flag
[00:43:30] To only update this specific test, also pass `--test-args issue-23281.rs`
[00:43:30] error: 1 errors occurred comparing output.
[00:43:30] status: exit code: 101
[00:43:30] status: exit code: 101
[00:43:30] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/issue-23281.rs" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-23281/a" "-Crpath" "-O" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-23281/auxiliary" "-A" "unused"
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] ------------------------------------------
[00:43:30] stderr:
[00:43:30] stderr:
[00:43:30] ------------------------------------------
[00:43:30] {"message":"the size for values of type `(dyn std::ops::Fn() + 'static)` cannot be known at compilation time","code":{"code":"E0277","explanation":"\nYou tried to use a type which doesn't implement some trait in a place which\nexpected that trait. Erroneous code example:\n\n```compile_fail,E0277\n// here we declare the Foo trait with a bar method\ntrait Foo {\n    fn bar(&self);\n}\n\n// we now declare a function which takes an object implementing the Foo trait\nfn some_func<T: Foo>(foo: T) {\n    foo.bar();\n}\n\nfn main() {\n    // we now call the method with the i32 type, which doesn't implement\n    // the Foo trait\n    some_func(5i32); // error: the trait bound `i32 : Foo` is not satisfied\n}\n```\n\nIn order to fix this error, verify that the type you're using does implement\nthe trait. Example:\n\n```\ntrait Foo {\n    fn bar(&self);\n}\n\nfn some_func<T: Foo>(foo: T) {\n    foo.bar(); // we can now use this method since i32 implements the\n               // Foo trait\n}\n\n// we implement the trait on the i32 type\nimpl Foo for i32 {\n    fn bar(&self) {}\n}\n\nfn main() {\n    some_func(5i32); // ok!\n}\n```\n\nOr in a generic context, an erroneous code example would look like:\n\n```compile_fail,E0277\nfn some_func<T>(foo: T) {\n    println!(\"{:?}\", foo); // error: the trait `core::fmt::Debug` is not\n                           //        implemented for the type `T`\n}\n\nfn main() {\n    // We now call the method with the i32 type,\n    // which *does* implement the Debug trait.\n    some_func(5i32);\n}\n```\n\nNote that the error here is in the definition of the generic function: Although\nwe only call it with a parameter that does implement `Debug`, the compiler\nstill rejects the function: It must work with all possible input types. In\norder to make this example compile, we need to restrict the generic type we're\naccepting:\n\n```\nuse std::fmt;\n\n// Restrict the input type to types that implement Debug.\nfn some_func<T: fmt::Debug>(foo: T) {\n    println!(\"{:?}\", foo);\n}\n\nfn main() {\n    // Calling the method is still fine, as i32 implements Debug.\n    some_func(5i32);\n\n    // This would fail to compile now:\n    // struct WithoutDebug;\n    // some_func(WithoutDebug);\n}\n```\n\nRust only looks at the signature of the called function, as such it must\nalready specify all requirements that will be used for every type parameter.\n"},"level":"error","spans":[{"file_name":"/checkout/src/test/ui/issue-23281.rs","byte_start":532,"byte_end":573,"line_start":16,"line_end":16,"column_start":5,"column_end":46,"is_primary":true,"text":[{"text":"    pub fn function(funs: Vec<Fn() -> ()>) {}","highlight_start":5,"highlight_end":46}],"label":"doesn't have a size known at compile-time","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"the trait `std::marker::Sized` is not implemented for `(dyn std::ops::Fn() + 'static)`","code":null,"level":"help","spans":[],"children":[],"rendered":null},{"message":"to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"required by `std::vec::Vec`","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"error[E0277]: the size for values of type `(dyn std::ops::Fn() + 'static)` cannot be known at compilation time\n  --> /checkout/src/test/ui/issue-23281.rs:16:5\n   |\nLL |     pub fn function(funs: Vec<Fn() -> ()>) {}\n   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time\n   |\n   = help: the trait `std::marker::Sized` is not implemented for `(dyn std::ops::Fn() + 'static)`\n   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>\n   = note: required by `std::vec::Vec`\n\n"}
[00:43:30] thread 'main' panicked at 'Some tests failed', tools/compiletest/src/main.rs:498:22
[00:43:30] {"message":"aborting due to previous error","code":null,"level":"error","spans":[],"children":[],"rendered":"error: aborting due to previous error\n\n"}
[00:43:30] {"message":"For more information about this error, try `rustc --explain E0277`.","code":null,"level":"","spans":[],"children":[],"rendered":"For more information about this error, try `rustc --explain E0277`.\n"}
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] thread '[ui] ui/issue-23281.rs' panicked at 'explicit panic', tools/compiletest/src/runtest.rs:3139:9
[00:43:30] 
[00:43:30] 
[00:43:30] ---- [ui] ui/issue-24446.rs stdout ----
[00:43:30] diff of stderr:
[00:43:30] 
[00:43:30] 24    | |_____^ doesn't have a size known at compile-time
[00:43:30] 25    |
[00:43:30] 26    = help: the trait `std::marker::Sized` is not implemented for `(dyn std::ops::Fn() -> u32 + 'static)`
[00:43:30] -    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
[00:43:30] +    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>
[00:43:30] 28    = note: constant expressions must have a statically known size
[00:43:30] 30 error: aborting due to 2 previous errors
[00:43:30] 
[00:43:30] 
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-24446/issue-24446.stderr
[00:43:30] To update references, rerun the tests and pass the `--bless` flag
[00:43:30] To only update this specific test, also pass `--test-args issue-24446.rs`
[00:43:30] error: 1 errors occurred comparing output.
[00:43:30] status: exit code: 101
[00:43:30] status: exit code: 101
[00:43:30] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/issue-24446.rs" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-24446/a" "-Crpath" "-O" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-24446/auxiliary" "-A" "unused"
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] ------------------------------------------
[00:43:30] stderr:
[00:43:30] stderr:
[00:43:30] ------------------------------------------
[00:43:30] {"message":"mismatched types","code":{"code":"E0308","explanation":"\nThis error occurs when the compiler was unable to infer the concrete type of a\nvariable. It can occur for several cases, the most common of which is a\nmismatch in the expected type that the compiler inferred for a variable's\ninitializing expression, and the actual type explicitly assigned to the\nvariable.\n\nFor example:\n\n```compile_fail,E0308\nlet x: i32 = \"I am not a number!\";\n//     ~~~   ~~~~~~~~~~~~~~~~~~~~\n//      |             |\n//      |    initializing expression;\n//      |    compiler infers type `&str`\n//      |\n//    type `i32` assigned to variable `x`\n```\n"},"level":"error","spans":[{"file_name":"/checkout/src/test/ui/issue-24446.rs","byte_start":509,"byte_end":619,"line_start":12,"line_end":16,"column_start":31,"column_end":6,"is_primary":true,"text":[{"text":"    static foo: Fn() -> u32 = || -> u32 {","highlight_start":31,"highlight_end":42},{"text":"        //~^ ERROR mismatched types","highlight_start":1,"highlight_end":36},{"text":"        //~| ERROR the size for values of type","highlight_start":1,"highlight_end":47},{"text":"        0","highlight_start":1,"highlight_end":10},{"text":"    };","highlight_start":1,"highlight_end":6}],"label":"expected trait std::ops::Fn, found closure","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"expected type `(dyn std::ops::Fn() -> u32 + 'static)`\n   found type `[closure@/checkout/src/test/ui/issue-24446.rs:12:31: 16:6]`","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"error[E0308]: mismatched types\n  --> /checkout/src/test/ui/issue-24446.rs:12:31\n   |\nLL |       static foo: Fn() -> u32 = || -> u32 {\n   |  _______________________________^\nLL | |         //~^ ERROR mismatched types\nLL | |         //~| ERROR the size for values of type\nLL | |         0\nLL | |     };\n   | |_____^ expected trait std::ops::Fn, found closure\n   |\n   = note: expected type `(dyn std::ops::Fn() -> u32 + 'static)`\n              found type `[closure@/checkout/src/test/ui/issue-24446.rs:12:31: 16:6]`\n\n"}
[00:43:30] {"message":"the size for values of type `(dyn std::ops::Fn() -> u32 + 'static)` cannot be known at compilation time","code":{"code":"E0277","explanation":"\nYou tried to use a type which doesn't implement some trait in a place which\nexpected that trait. Erroneous code example:\n\n```compile_fail,E0277\n// here we declare the Foo trait with a bar method\ntrait Foo {\n    fn bar(&self);\n}\n\n// we now declare a function which takes an object implementing the Foo trait\nfn some_func<T: Foo>(foo: T) {\n    foo.bar();\n}\n\nfn main() {\n    // we now call the method with the i32 type, which doesn't implement\n    // the Foo trait\n    some_func(5i32); // error: the trait bound `i32 : Foo` is not satisfied\n}\n```\n\nIn order to fix this error, verify that the type you're using does implement\nthe trait. Example:\n\n```\ntrait Foo {\n    fn bar(&self);\n}\n\nfn some_func<T: Foo>(foo: T) {\n    foo.bar(); // we can now use this method since i32 implements the\n               // Foo trait\n}\n\n// we implement the trait on the i32 type\nimpl Foo for i32 {\n    fn bar(&self) {}\n}\n\nfn main() {\n    some_func(5i32); // ok!\n}\n```\n\nOr in a generic context, an erroneous code example would look like:\n\n```compile_fail,E0277\nfn some_func<T>(foo: T) {\n    println!(\"{:?}\", foo); // error: the trait `core::fmt::Debug` is not\n                           //        implemented for the type `T`\n}\n\nfn main() {\n    // We now call the method with the i32 type,\n    // which *does* implement the Debug trait.\n    some_func(5i32);\n}\n```\n\nNote that the error here is in the definition of the generic function: Although\nwe only call it with a parameter that does implement `Debug`, the compiler\nstill rejects the function: It must work with all possible input types. In\norder to make this example compile, we need to restrict the generic type we're\naccepting:\n\n```\nuse std::fmt;\n\n// Restrict the input type to types that implement Debug.\nfn some_func<T: fmt::Debug>(foo: T) {\n    println!(\"{:?}\", foo);\n}\n\nfn main() {\n    // Calling the method is still fine, as i32 implements Debug.\n    some_func(5i32);\n\n    // This would fail to compile now:\n    // struct WithoutDebug;\n    // some_func(WithoutDebug);\n}\n```\n\nRust only looks at the signature of the called function, as such it must\nalready specify all requirements that will be used for every type parameter.\n"},"level":"error","spans":[{"file_name":"/checkout/src/test/ui/issue-24446.rs","byte_start":509,"byte_end":619,"line_start":12,"line_end":16,"column_start":31,"column_end":6,"is_primary":true,"text":[{"text":"    static foo: Fn() -> u32 = || -> u32 {","highlight_start":31,"highlight_end":42},{"text":"        //~^ ERROR mismatched types","highlight_start":1,"highlight_end":36},{"text":"        //~| ERROR the size for values of type","highlight_start":1,"highlight_end":47},{"text":"        0","highlight_start":1,"highlight_end":10},{"text":"    };","highlight_start":1,"highlight_end":6}],"label":"doesn't have a size known at compile-time","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"the trait `std::marker::Sized` is not implemented for `(dyn std::ops::Fn() -> u32 + 'static)`","code":null,"level":"help","spans":[],"children":[],"rendered":null},{"message":"to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"constant expressions must have a statically known size","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"error[E0277]: the size for values of type `(dyn std::ops::Fn() -> u32 + 'static)` cannot be known at compilation time\n  --> /checkout/src/test/ui/issue-24446.rs:12:31\n   |\nLL |       static foo: Fn() -> u32 = || -> u32 {\n   |  _______________________________^\nLL | |         //~^ ERROR mismatched types\nLL | |   :30] +    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>
[00:43:30] 9    = help: consider adding a `where T: std::marker::Sized` bound
[00:43:30] 10    = note: only the last field of a struct may have a dynamically sized type
[00:43:30] 
[00:43:30] 
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-27060-2/issue-27060-2.stderr
[00:43:30] To update references, rerun the tests and pass the `--bless` flag
[00:43:30] To only update this specific test, also pass `--test-args issue-27060-2.rs`
[00:43:30] error: 1 errors occurred comparing output.
[00:43:30] status: exit code: 101
[00:43:30] status: exit code: 101
[00:43:30] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/issue-27060-2.rs" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-27060-2/a" "-Crpath" "-O" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-27060-2/auxiliary" "-A" "unused"
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] ------------------------------------------
[00:43:30] stderr:
[00:43:30] stderr:
[00:43:30] ------------------------------------------
[00:43:30] {"message":"the size for values of type `T` cannot be known at compilation time","code":{"code":"E0277","explanation":"\nYou tried to use a type which doesn't implement some trait in a place which\nexpected that trait. Erroneous code example:\n\n```compile_fail,E0277\n// here we declare the Foo trait with a bar method\ntrait Foo {\n    fn bar(&self);\n}\n\n// we now declare a function which takes an object implementing the Foo trait\nfn some_func<T: Foo>(foo: T) {\n    foo.bar();\n}\n\nfn main() {\n    // we now call the method with the i32 type, which doesn't implement\n    // the Foo trait\n    some_func(5i32); // error: the trait bound `i32 : Foo` is not satisfied\n}\n```\n\nIn order to fix this error, verify that the type you're using does implement\nthe trait. Example:\n\n```\ntrait Foo {\n    fn bar(&self);\n}\n\nfn some_func<T: Foo>(foo: T) {\n    foo.bar(); // we can now use this method since i32 implements the\n               // Foo trait\n}\n\n// we implement the trait on the i32 type\nimpl Foo for i32 {\n    fn bar(&self) {}\n}\n\nfn main() {\n    some_func(5i32); // ok!\n}\n```\n\nOr in a generic context, an erroneous code example would look like:\n\n```compile_fail,E0277\nfn some_func<T>(foo: T) {\n    println!(\"{:?}\", foo); // error: the trait `core::fmt::Debug` is not\n                           //        implemented for the type `T`\n}\n\nfn main() {\n    // We now call the method with the i32 type,\n    // which *does* implement the Debug trait.\n    some_func(5i32);\n}\n```\n\nNote that the error here is in the definition of the generic function: Although\nwe only call it with a parameter that does implement `Debug`, the compiler\nstill rejects the function: It must work with all possible input types. In\norder to make this example compile, we need to restrict the generic type we're\naccepting:\n\n```\nuse std::fmt;\n\n// Restrict the input type to types that implement Debug.\nfn some_func<T: fmt::Debug>(foo: T) {\n    println!(\"{:?}\", foo);\n}\n\nfn main() {\n    // Calling the method is still fine, as i32 implements Debug.\n    some_func(5i32);\n\n    // This would fail to compile now:\n    // struct WithoutDebug;\n    // some_func(WithoutDebug);\n}\n```\n\nRust only looks at the signature of the called function, as such it must\nalready specify all requirements that will be used for every type parameter.\n"},"level":"error","spans":[{"file_name":"/checkout/src/test/ui/issue-27060-2.rs","byte_start":515,"byte_end":522,"line_start":13,"line_end":13,"column_start":5,"column_end":12,"is_primary":true,"text":[{"text":"    data: T, //~ ERROR the size for values of type","highlight_start":5,"highlight_end":12}],"label":"doesn't have a size known at compile-time","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"the trait `std::marker::Sized` is not implemented for `T`","code":null,"level":"help","spans":[],"children":[],"rendered":null},{"message":"to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"consider adding a `where T: std::marker::Sized` bound","code":null,"level":"help","spans":[],"children":[],"rendered":null},{"message":"only the last field of a struct may have a dynamically sized type","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"error[E0277]: the size for values of type `T` cannot be known at compilation time\n  --> /checkout/src/test/ui/issue-27060-2.rs:13:5\n   |\nLL |     data: T, //~ ERROR the size for values of type\n   |     ^^^^^^^ doesn't have a size known at compile-time\n   |\n   = help: the trait `std::marker::Sized` is not implemented for `T`\n   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>\n   = help: consider adding a `where T: std::marker::Sized` bound\n   = note: only the last field of a struct may have a dynamically sized type\n\n"}
[00:43:30] {"message":"aborting due to previous error","code":null,"level":"error","spans":[],"children":[],"rendered":"error: aborting due to previous error\n\n"}
[00:43:30] {"message":"For more information about this error, try `rustc --explain E0277`.","code":null,"level":"","spans":[],"children":[],"rendered":"For more information about this error, try `rustc --explain E0277`.\n"}
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] thread '[ui] ui/issue-27060-2.rs' panicked at 'explicit panic', tools/compiletest/src/runtest.rs:3139:9
[00:43:30] 
[00:43:30] 
[00:43:30] ---- [ui] ui/issue-27078.rs stdout ----
[00:43:30] diff of stderr:
[00:43:30] 
[00:43:30] 5    |            ^^^^ doesn't have a size known at compile-time
[00:43:30] 7    = help: the trait `std::marker::Sized` is not implemented for `Self`
[00:43:30] 7    = help: the trait `std::marker::Sized` is not implemented for `Self`
[00:43:30] -    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
[00:43:30] +    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>
[00:43:30] 9    = help: consider adding a `where Self: std::marker::Sized` bound
[00:43:30] 10    = note: all local variables must have a statically known size
[00:43:30] 
[00:43:30] 
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-27078/issue-27078.stderr
[00:43:30] Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-27078/issue-27078.stderr
[00:43:30] To update references, rerun the tests and pass the `--bless` flag
[00:43:30] To only update this specific test, also pass `--test-args issue-27078.rs`
[00:43:30] error: 1 errors occurred comparing output.
[00:43:30] status: exit code: 101
[00:43:30] status: exit code: 101
[00:43:30] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/issue-27078.rs" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-27078/a" "-Crpath" "-O" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-27078/auxiliary" "-A" "unused"
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] ------------------------------------------
[00:43:30] stderr:
[00:43:30] stderr:
[00:43:30] ------------------------------------------
[00:43:30] {"message":"the size for values of type `Self` cannot be known at compilation time","code":{"code":"E0277","explanation":"\nYou tried to use a type which doesn't implement some trait in a place which\nexpected that trait. Erroneous code example:\n\n```compile_fail,E0277\n// here we declare the Foo trait with a bar method\ntrait Foo {\n    fn bar(&self);\n}\n\n// we now declare a function which takes an object implementing the Foo trait\nfn some_func<T: Foo>(foo: T) {\n    foo.bar();\n}\n\nfn main() {\n    // we now call the method with the i32 type, which doesn't implement\n    // the Foo trait\n    some_func(5i32); // error: the trait bound `i32 : Foo` is not satisfied\n}\n```\n\nIn order to fix this error, verify that the type you're using does implement\nthe trait. Example:\n\n```\ntrait Foo {\n    fn bar(&self);\n}\n\nfn some_func<T: Foo>(foo: T) {\n    foo.bar(); // we can now use this method since i32 implements the\n               // Foo trait\n}\n\n// we implement the trait on the i32 type\nimpl Foo for i32 {\n    fn bar(&self) {}\n}\n\nfn main() {\n    some_func(5i32); // ok!\n}\n```\n\nOr in a generic context, an erroneous code example would look like:\n\n```compile_fail,E0277\nfn some_func<T>(foo: T) {\n    println!(\"{:?}\", foo); // error: the trait `core::fmt::Debug` is not\n                           //        implemented for the type `T`\n}\n\nfn main() {\n    // We now call the method with the i32 type,\n    // which *does* implement the Debug trait.\n    some_func(5i32);\n}\n```\n\nNote that the error here is in the definition of the generic function: Although\nwe only call it with a parameter that does implement `Debug`, the compiler\nstill rejects the function: It must work with all possible input types. In\norder to make this example compile, we need to restrict the generic type we're\naccepting:\n\n```\nuse std::fmt;\n\n// Restrict the input type to types that implement Debug.\nfn some_func<T: fmt::Debug>(foo: T) {\n    println!(\"{:?}\", foo);\n}\n\nfn main() {\n    // Calling the method is still fine, as i32 implements Debug.\n    some_func(5i32);\n\n    // This would fail to compile now:\n    // struct WithoutDebug;\n    // some_func(WithoutDebug);\n}\n```\n\nRust only looks at the signature of the called function, as such it must\nalready specify all requirements that will be used for every type parameter.\n"},"level":"error","spans":[{"file_name":"/checkout/src/test/ui/issue-27078.rs","byte_start":542,"byte_end":546,"line_start":15,"line_end":15,"column_start":12,"column_end":16,"is_primary":true,"text":[{"text":"    fn foo(self) -> &'static i32 {","highlight_start":12,"highlight_end":16}],"label":"doesn't have a size known at compile-time","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"the trait `std::marker::Sized` is not implemented for `Self`","code":null,"level":"help","spans":[],"children":[],"rendered":null},{"message":"to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"consider adding a `where Self: std::marker::Sized` bound","code":null,"level":"help","spans":[],"children":[],"rendered":null},{"message":"all local variables  visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
[00:43:30] +    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>
[00:43:30] 9    = note: no field of an enum variant may have a dynamically sized type
[00:43:30] 11 error: aborting due to previous error
[00:43:30] 
[00:43:30] 
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-35988/issue-35988.stderr
[00:43:30] To update references, rerun the tests and pass the `--bless` flag
[00:43:30] To only update this specific test, also pass `--test-args issue-35988.rs`
[00:43:30] error: 1 errors occurred comparing output.
[00:43:30] status: exit code: 101
[00:43:30] status: exit code: 101
[00:43:30] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/issue-35988.rs" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-35988/a" "-Crpath" "-O" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-35988/auxiliary" "-A" "unused"
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] ------------------------------------------
[00:43:30] stderr:
[00:43:30] stderr:
[00:43:30] ------------------------------------------
[00:43:30] {"message":"the size for values of type `[std::boxed::Box<E>]` cannot be known at compilation time","code":{"code":"E0277","explanation":"\nYou tried to use a type which doesn't implement some trait in a place which\nexpected that trait. Erroneous code example:\n\n```compile_fail,E0277\n// here we declare the Foo trait with a bar method\ntrait Foo {\n    fn bar(&self);\n}\n\n// we now declare a function which takes an object implementing the Foo trait\nfn some_func<T: Foo>(foo: T) {\n    foo.bar();\n}\n\nfn main() {\n    // we now call the method with the i32 type, which doesn't implement\n    // the Foo trait\n    some_func(5i32); // error: the trait bound `i32 : Foo` is not satisfied\n}\n```\n\nIn order to fix this error, verify that the type you're using does implement\nthe trait. Example:\n\n```\ntrait Foo {\n    fn bar(&self);\n}\n\nfn some_func<T: Foo>(foo: T) {\n    foo.bar(); // we can now use this method since i32 implements the\n               // Foo trait\n}\n\n// we implement the trait on the i32 type\nimpl Foo for i32 {\n    fn bar(&self) {}\n}\n\nfn main() {\n    some_func(5i32); // ok!\n}\n```\n\nOr in a generic context, an erroneous code example would look like:\n\n```compile_fail,E0277\nfn some_func<T>(foo: T) {\n    println!(\"{:?}\", foo); // error: the trait `core::fmt::Debug` is not\n                           //        implemented for the type `T`\n}\n\nfn main() {\n    // We now call the method with the i32 type,\n    // which *does* implement the Debug trait.\n    some_func(5i32);\n}\n```\n\nNote that the error here is in the definition of the generic function: Although\nwe only call it with a parameter that does implement `Debug`, the compiler\nstill rejects the function: It must work with all possible input types. In\norder to make this example compile, we need to restrict the generic type we're\naccepting:\n\n```\nuse std::fmt;\n\n// Restrict the input type to types that implement Debug.\nfn some_func<T: fmt::Debug>(foo: T) {\n    println!(\"{:?}\", foo);\n}\n\nfn main() {\n    // Calling the method is still fine, as i32 implements Debug.\n    some_func(5i32);\n\n    // This would fail to compile now:\n    // struct WithoutDebug;\n    // some_func(WithoutDebug);\n}\n```\n\nRust only looks at the signature of the called function, as such it must\nalready specify all requirements that will be used for every type parameter.\n"},"level":"error","spans":[{"file_name":"/checkout/src/test/ui/issue-35988.rs","byte_start":482,"byte_end":490,"line_start":12,"line_end":12,"column_start":7,"column_end":15,"is_primary":true,"text":[{"text":"    V([Box<E>]),","highlight_start":7,"highlight_end":15}],"label":"doesn't have a size known at compile-time","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"the trait `std::marker::Sized` is not implemented for `[std::boxed::Box<E>]`","code":null,"level":"help","spans":[],"children":[],"rendered":null},{"message":"to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"no field of an enum variant may have a dynamically sized type","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"error[E0277]: the size for values of type `[std::boxed::Box<E>]` cannot be known at compilation time\n  --> /checkout/src/test/ui/issue-35988.rs:12:7\n   |\nLL |     V([Box<E>]),\n   |       ^^^^^^^^ doesn't have a size known at compile-time\n   |\n   = help: the trait `std::marker::Sized` is not implemented for `[std::boxed::Box<E>]`\n   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>\n   = note: no field of an enum variant may have a dynamically sized type\n\n"}
[00:43:30] {"message":"aborting due to previous error","code":null,"level":"error","spans":[],"children":[],"rendered":"error: aborting due to previous error\n\n"}
[00:43:30] {"message":"For more information about this error, try `rustc --explain E0277`.","code":null,"level":"","spans":[],"children":[],"rendered":"For more information about this error, try `rustc --explain E0277`.\n"}
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] thread '[ui] ui/issue-35988.rs' panicked at 'explicit panic', tools/compiletest/src/runtest.rs:3139:9
[00:43:30] 
[00:43:30] 
[00:43:30] ---- [ui] ui/issue-38954.rs stdout ----
[00:43:30] diff of stderr:
[00:43:30] 
[00:43:30] 5    |                       ^ doesn't have a size known at compile-time
[00:43:30] 6    |
[00:43:30] 7    = help: the trait `std::marker::Sized` is not implemented for `str`
[00:43:30] -    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types--sized>
[00:43:30] +    = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>
[00:43:30] 10 error: aborting due to previous error
[00:43:30] 11 
[00:43:30] 
[00:43:30] 
[00:43:30] 
[00:43:30] The actual stderr differed from the expected stderr.
[00:43:30] Actual stderr saved to /checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-38954/issue-38954.stderr
[00:43:30] To update references, rerun the tests and pass the `--bless` flag
[00:43:30] To only update this specific test, also pass `--test-args issue-38954.rs`
[00:43:30] error: 1 errors occurred comparing output.
[00:43:30] status: exit code: 101
[00:43:30] status: exit code: 101
[00:43:30] command: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/src/test/ui/issue-38954.rs" "--target=x86_64-unknown-linux-gnu" "--error-format" "json" "-Zui-testing" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-38954/a" "-Crpath" "-O" "-Zunstable-options" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/issue-38954/auxiliary" "-A" "unused"
[00:43:30] ------------------------------------------
[00:43:30] 
[00:43:30] ------------------------------------------
[00:43:30] stderr:
[00:43:30] stderr:
[00:43:30] ------------------------------------------
[00:43:30] {"message":"the size for values of type `str` cannot be known at compilation time","code":{"code":"E0277","explanation":"\nYou tried to use a type which doesn't implement some trait in a place which\nexpected that trait. Erroneous code example:\n\n```compile_fail,E0277\n// here we declare the Foo trait with a bar method\ntrait Foo {\n    fn bar(&self);\n}\n\n// we now declare a function which takes an object implementing the Foo trait\nfn some_func<T: Foo>(foo: T) {\n    foo.bar();\n}\n\nfn main() {\n    // we now call the method with the i32 type, which doesn't implement\n    // the Foo trait\n    some_func(5i32); // error: the trait bound `i32 : Foo` is not satisfied\n}\n```\n\nIn order to fix this error, verify that the type you're using does implement\nthe trait. Example:\n\n```\ntrait Foo {\n    fn bar(&self);\n}\n\nfn some_func<T: Foo>(foo: T) {\n    foo.bar(); // we can now use this method since i32 implements the\n               // Foo trait\n}\n\n// we implement the trait on the i32 type\nimpl Foo for i32 {\n    fn bar(&self) {}\n}\n\nfn main() {\n    some_func(5i32); // ok!\n}\n```\n\nOr in a generic context, an erroneous code example would look like:\n\n```compile_fail,E0277\nfn some_func<T>(foo: T) {\n    println!(\"{:?}\", foo); // error: the trait `core::fmt::Debug` is not\n                           //        implemented for the type `T`\n}\n\nfn main() {\n    // We now call the method with the i32 type,\n    // which *does* implement the Debug trait.\n    some_func(5i32);\n}\n```\n\nNote that the error here is in the definition of the generic function: Although\nwe only call it with a parameter that does implement `Debug`, the compiler\nstill rejects the function: It must work with all possible input types. In\norder to make this example compile, we need to restrict the generic type we're\naccepting:\n\n```\nuse std::fmt;\n\n// Restrict the input type to types that implement Debug.\nfn some_func<T: fmt::Debug>(foo: T) {\n    println!(\"{:?}\", foo);\n}\n\nfn main() {\n    // Calling the method is still fine, as i32 implements Debug.\n    some_func(5i32);\n\n    // This would fail to compile now:\n    // struct WithoutDebug;\n    // some_func(WithoutDebug);\n}\n```\n\nRust only looks at the signature of the called function, as such it must\nalready specify all requirements that will be used for every type parameter.\n"},"level":"error","spans":[{"file_name":"/checkout/src/test/ui/issue-38954.rs","byte_start":489,"byte_end":489,"line_start":11,"line_end":11,"column_start":23,"column_end":23,"is_primary":true,"text":[{"text":"fn _test(ref _p: str) {}","highlight_start":23,"highlight_end":23}],"label":"doesn't have a size known at compile-time","suggested_replacement":null,"suggestion_applicability":null,"expansion":null}],"children":[{"message":"the trait `std::marker::Sized` is not implemented for `str`","code":null,"level":"help","spans":[],"children":[],"rendered":null},{"message":"to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>","code":null,"level":"note","spans":[],"children":[],"rendered":null}],"rendered":"error[E0277]: the size for values of type `str` cannot be known at compilation time\n  --> /checkout/src/test/ui/issue-38954.rs:11:23\n   |\nLL | fn _test(ref _p: str) {}\n   |                       ^ doesn't have a size known at compile-time\n   |\n   = help: the trait `std::marker::Sized` is not implemented for `str`\n   = note: to learn more, visit <https://doc.rust-lang.org/book/second-edition/ch19-04-advanced-types.html#dynamically-sized-types-and-sized>\n\n"}
[00:43:30] {"message":"aborting due to previous error","code":null,"level":"error","spans":[],"children":[],"rendered":"error: aborting due to previous error\n\n"}
[00:43:30] {"message":"For more information about this error, try `rustc --explain E0277`.","code":null,"level":"","spans":[],"children":[],"rendered":"For more information about this error, try `rustc --explain E0277`.\n"}
[00:43:30] ------------------------------------------
[00:43:30] 
---
[00:43:30] test result: FAILED. 2095 passed; 18 failed; 6 ignored; 0 measured; 0 filtered out
[00:43:30] 
[00:43:30] 
[00:43:30] 
[00:43:30] command did not execute successfully: "/checkout/obj/build/x86_64-unknown-linux-gnu/stage0-tools-bin/compiletest" "--compile-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib" "--run-lib-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/x86_64-unknown-linux-gnu/lib" "--rustc-path" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "--src-base" "/checkout/src/test/ui" "--build-base" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui" "--stage-id" "stage2-x86_64-unknown-linux-gnu" "--mode" "ui" "--target" "x86_64-unknown-linux-gnu" "--host" "x86_64-unknown-linux-gnu" "--llvm-filecheck" "/usr/lib/llvm-5.0/bin/FileCheck" "--host-rustcflags" "-Crpath -O -Zunstable-options " "--target-rustcflags" "-Crpath -O -Zunstable-options  -Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--docck-python" "/usr/bin/python2.7" "--lldb-python" "/usr/bin/python2.7" "--gdb" "/usr/bin/gdb" "--quiet" "--llvm-version" "5.0.0\n" "--system-llvm" "--cc" "" "--cxx" "" "--cflags" "" "--llvm-components" "" "--llvm-cxxflags" "" "--adb-path" "adb" "--adb-test-dir" "/data/tmp/work" "--android-cross-path" "" "--color" "always"
[00:43:30] 
[00:43:30] 
[00:43:30] failed to run: /checkout/obj/build/bootstrap/debug/bootstrap test
[00:43:30] Build completed unsuccessfully in 0:01:39
[00:43:30] Build completed unsuccessfully in 0:01:39
[00:43:30] make: *** [check] Error 1
[00:43:30] Makefile:58: recipe for target 'check' failed

The command "stamp sh -x -c "$RUN_SCRIPT"" exited with 2.
travis_time:start:00c0b430
$ date && (curl -fs --head https://google.com | grep ^Date: | sed 's/Date: //g' || true)

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN. (Feature Requests)

[kennytm]

@bors r+

Removed #52404.

[bors]

📌 Commit c0db1aa has been approved by kennytm

[bors]

⌛ Testing commit c0db1aa with merge 4bff385...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: kennytm
Pushing 4bff385 to master...

[rust-highfive]

📣 Toolstate changed by #52433!

Tested on commit 4bff385.
Direct link to PR: #52433

🎉 miri on windows: build-fail → test-pass.
🎉 miri on linux: build-fail → test-pass.
🎉 nomicon on windows: test-fail → test-pass.
🎉 nomicon on linux: test-fail → test-pass.