Android has the ability to supply an abort message [1]. This message is
automatically included in the debug trace, which helps debugging [2].
Modify panic_abort to populate this message before calling abort().

[1] https://android.googlesource.com/platform/bionic/+/master/libc/include/android/set_abort_message.h
[2] https://source.android.com/devices/tech/debug/native-crash

This error probably almost never happens, but we should still use the
diagnostic infrastructure. My guess is that the error was added back
before rustdoc used the rustc diagnostic infrastructure (it was all
`println!` and `eprintln!` back then!) and since it likely rarely occurs
and this code doesn't change that much, no one thought to transition it
to using diagnostics.

Note that the old error was actually a warning (it didn't stop the rest
of doc building). It seems very unlikely that this would fail without
the rest of the doc build failing, so it makes more sense for it to be a
hard error.

The error looks like this:

    error: failed to render source code for `src/test/rustdoc/smart-punct.rs`: "bar": foo
      --> src/test/rustdoc/smart-punct.rs:3:1
       |
    3  | / #![crate_name = "foo"]
    4  | |
    5  | | //! This is the "start" of the 'document'! How'd you know that "it's" ...
    6  | | //!
    ...  |
    22 | | //! I say "don't smart-punct me -- please!"
    23 | | //! ```
       | |_______^

I wasn't sure how to trigger the error, so to create that message I
temporarily made rustdoc always emit it. That's also why it says "bar"
and "foo" instead of a real error message.

Note that the span of the diagnostic starts at line 3 because line 1 of
that file is a (non-doc) comment and line 2 is a blank line.

Proper Unix terminology is "exit status" (vs "wait status").  "exit
code" is imprecise on Unix and therefore unclear.  (As far as I can
tell, "exit code" is correct terminology on Windows.)

This new wording is unfortunately inconsistent with the identifier
names in the Rust stdlib.

It is the identifier names that are wrong, as discussed at length in eg
  https://doc.rust-lang.org/nightly/std/process/struct.ExitStatus.html
  https://doc.rust-lang.org/nightly/std/os/unix/process/trait.ExitStatusExt.html

Unfortunately for API stability reasons it would be a lot of work, and
a lot of disruption, to change the names in the stdlib (eg to rename
`std::process::ExitStatus` to `std::process::ChildStatus` or
something), but we should fix the message output.  Many (probably
most) readers of these messages about exit statuses will be users and
system administrators, not programmers, who won't even know that Rust
has this wrong terminology.

So I think the right thing is to fix the documentation (as I have
already done) and, now, the terminology in the implementation.

This is a user-visible change to the behaviour of all Rust programs
which run Unix subprocesses.  Hopefully no-one is matching against the
exit status string, except perhaps in tests.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

the test harness already spawns enough tests for all cores, individual
tests should keep their own threading to a minimum to avoid context switch
overhead

some tests fail with 1 CGU, so explicit compile flags have been added
to keep their old behavior

# Conflicts:
#	src/test/ui/asm/sym.rs

When the character next to `{}` is "shifted" (when mapping a byte index
in the format string to span) we should avoid shifting the span end
index, so first map the index of `}` to span, then bump the span,
instead of first mapping the next byte index to a span (which causes
bumping the end span too much).

Regression test added.

Fixes rust-lang#83344

…ou-se

android: set abort message

Android has the ability to supply an abort message [1]. This message is
automatically included in the debug trace, which helps debugging [2].
Modify panic_abort to populate this message before calling abort().

[1] https://android.googlesource.com/platform/bionic/+/master/libc/include/android/set_abort_message.h
[2] https://source.android.com/devices/tech/debug/native-crash

…ark-Simulacrum

reduce threads spawned by ui-tests

The test harness already spawns enough tests to keep all cores busy.
Individual tests should keep their own threading to a minimum to avoid context switch overhead.

When running ui tests with lld enabled this shaves about 10% off that testsuite on my machine.

Resolves rust-lang#81946

…bank

update array missing `IntoIterator` msg

fixes rust-lang#82602

r? `@estebank` do you know whether we can use the expr span in `rustc_on_unimplemented`? The label isn't too great rn

rustdoc: Use diagnostics for error when including sources

This error probably almost never happens, but we should still use the
diagnostic infrastructure. My guess is that the error was added back
before rustdoc used the rustc diagnostic infrastructure (it was all
`println!` and `eprintln!` back then!) and since it likely rarely occurs
and this code doesn't change that much, no one thought to transition it
to using diagnostics.

Note that the old error was actually a warning (it didn't stop the rest
of doc building). It seems very unlikely that this would fail without
the rest of the doc build failing, so it makes more sense for it to be a
hard error.

The error looks like this:

    error: failed to render source code for `src/test/rustdoc/smart-punct.rs`: "bar": foo
      --> src/test/rustdoc/smart-punct.rs:3:1
       |
    3  | / #![crate_name = "foo"]
    4  | |
    5  | | //! This is the "start" of the 'document'! How'd you know that "it's" ...
    6  | | //!
    ...  |
    22 | | //! I say "don't smart-punct me -- please!"
    23 | | //! ```
       | |_______^

I wasn't sure how to trigger the error, so to create that message I
temporarily made rustdoc always emit it. That's also why it says "bar"
and "foo" instead of a real error message.

Note that the span of the diagnostic starts at line 3 because line 1 of
that file is a (non-doc) comment and line 2 is a blank line.

escape_ascii take 2

The previous PR, rust-lang#73111 was closed for inactivity; since I've had trouble in the past reopening closed PRs, I'm just making a new one.

I'm still running the tests locally but figured I'd open the PR in the meantime. Will fix whatever errors show up so we don't have to wait again for this.

r? `@m-ou-se`

format macro argument parsing fix

When the character next to `{}` is "shifted" (when mapping a byte index
in the format string to span) we should avoid shifting the span end
index, so first map the index of `}` to span, then bump the span,
instead of first mapping the next byte index to a span (which causes
bumping the end span too much).

Regression test added.

Fixes rust-lang#83344

---

r? `@estebank`

…, r=joshtriplett

ExitStatus: print "exit status: {}" rather than "exit code: {}" on unix

Proper Unix terminology is "exit status" (vs "wait status").  "exit
code" is imprecise on Unix and therefore unclear.  (As far as I can
tell, "exit code" is correct terminology on Windows.)

This new wording is unfortunately inconsistent with the identifier
names in the Rust stdlib.

It is the identifier names that are wrong, as discussed at length in eg
  https://doc.rust-lang.org/nightly/std/process/struct.ExitStatus.html
  https://doc.rust-lang.org/nightly/std/os/unix/process/trait.ExitStatusExt.html

Unfortunately for API stability reasons it would be a lot of work, and
a lot of disruption, to change the names in the stdlib (eg to rename
`std::process::ExitStatus` to `std::process::ChildStatus` or
something), but we should fix the message output.  Many (probably
most) readers of these messages about exit statuses will be users and
system administrators, not programmers, who won't even know that Rust
has this wrong terminology.

So I think the right thing is to fix the documentation (as I have
already done) and, now, the terminology in the implementation.

This is a user-visible change to the behaviour of all Rust programs
which run Unix subprocesses.  Hopefully no-one is matching against the
exit status string, except perhaps in tests.

lazily calls some fns

Replaced some fn's with it's lazy variants.