Many tests use stdout and stderr to validate whether the test emitted
the correct output. Because fuchsia-test-runner.py was sending all
logs, including test output, to stdout, tests could not validate
output properly.

This change removes the runner logs from stdout and stderr entirely
with the exception of output from the test. All runner logs are still
available in the "log" file.

Fixed: https://fxbug.dev/351356417

Applied formatting suggestions from isort and black via pylsp.

This is adding a migration lint for the current (in the 2021 edition and previous)
to move expr to expr_2021 from expr

Co-Developed-by: Eric Holk
Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>

Co-Developed-by: Eric Holk
Signed-off-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>

Both test-panic-abort-nocapture.rs and test-panic-abort.rs assert the
stderr output of the test. On Fuchsia, if a test fails an assertion,
this output will contain a line noting the process returned the code
-1028 (ZX_TASK_RETCODE_EXCEPTION_KILL). But the asserted stderr output
lacks this note. Presumably this is because other platforms implement
-Cpanic=abort by killing the process instead of returned a status
code.

…mes_in_associated_constant, r=BoxyUwU

Bump `elided_lifetimes_in_associated_constant` to deny

It's been 5 versions since this was last bumped. Let's bump it up again.

…xpr2024, r=compiler-errors,eholk

migration lint for `expr2024` for the edition 2024

This is adding a migration lint for the current (in the 2021 edition and previous)
to move expr to expr_2021 from expr

Issue rust-lang#123742

I created also a repository to test out the migration https://github.com/vincenzopalazzo/expr2024-cargo-fix-migration

Co-Developed-by: ``@eholk``

…dtolnay

impl FusedIterator and a size hint for the error sources iter

cc tracking issue rust-lang#58520

…r=tmandry

Fixup failing fuchsia tests

The Fuchsia platform passes all tests with these changes. Two tests are ignored because they rely on Fuchsia not returning a status code upon a process aborting. See rust-lang#102032 and rust-lang#58590 for more details on that topic.

Many formatting changes are also included in this PR.

r? tmandry
r? erickt

…e-doc, r=fmease

`#[doc(alias)]`'s doc: say that ASCII spaces are allowed

PR rust-lang#77570 allowed ASCII spaces in doc aliases, but the documentation wasn't updated to say so.

The code checking the aliases:
https://github.com/rust-lang/rust/blob/7fdefb804ec300fb605039522a7c0dfc9e7dc366/compiler/rustc_passes/src/check_attr.rs#L693-L704

``````@rustbot`````` label +A-docs

…-errors

small search graph refactor

small improvements which shouldn't impact behavior.

r? ``````@compiler-errors``````

…-pings, r=lqd

Remove spastorino from SMIR

r? ```@oli-obk```

documentation: update cmake version

Previously discussed here: rust-lang#127531