`tests/ui/meta/revision-bad.rs#foo` test failure on `master`

[onkoe]

Hey there! I'm experiencing a weird issue where the tests/ui/meta/revision-bad.rs#foo test fails on the latest master branch commit when I run ./x test. The issue has occurred for me since at least 1b6d674 and still occurs now (e6eb451).

barrett@farts ~/D/p/c/rust (master)> ./x test tests/ui/meta/revision-bad.rs --verbose
# (snip)
running 2 tests
test [ui] tests/ui/meta/revision-bad.rs#bar ... ok
test [ui] tests/ui/meta/revision-bad.rs#foo ... FAILED

failures:

---- [ui] tests/ui/meta/revision-bad.rs#foo stdout ----

executing env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/home/barrett/Documents/projects/contributions/rust/build/x86_64-unknown-linux-gnu/stage1/bin/rustc" "/home/barrett/Documents/projects/contributions/rust/tests/ui/meta/revision-bad.rs" "-Zthreads=1" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/home/barrett/.cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/home/barrett/Documents/projects/contributions/rust/vendor" "--sysroot" "/home/barrett/Documents/projects/contributions/rust/build/x86_64-unknown-linux-gnu/stage1" "--target=x86_64-unknown-linux-gnu" "--cfg" "foo" "--check-cfg" "cfg(FALSE,foo,bar)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "-C" "prefer-dynamic" "-o" "/home/barrett/Documents/projects/contributions/rust/build/x86_64-unknown-linux-gnu/test/ui/meta/revision-bad.foo/a" "-A" "unused" "-A" "internal_features" "-Crpath" "-Cdebuginfo=0" "-Lnative=/home/barrett/Documents/projects/contributions/rust/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/home/barrett/Documents/projects/contributions/rust/build/x86_64-unknown-linux-gnu/test/ui/meta/revision-bad.foo/auxiliary"
------stdout------------------------------

------stderr------------------------------

------------------------------------------
executing cd "/home/barrett/Documents/projects/contributions/rust/build/x86_64-unknown-linux-gnu/test/ui/meta/revision-bad.foo" && RUSTC="/home/barrett/Documents/projects/contributions/rust/build/x86_64-unknown-linux-gnu/stage1/bin/rustc" RUST_TEST_THREADS="16" "/home/barrett/Documents/projects/contributions/rust/build/x86_64-unknown-linux-gnu/test/ui/meta/revision-bad.foo/a"
------stdout------------------------------

------stderr------------------------------
thread 'main' panicked at /home/barrett/Documents/projects/contributions/rust/tests/ui/meta/revision-bad.rs:13:5:
foo
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

------------------------------------------

NOTE: test did not panic as expected

failures:
    [ui] tests/ui/meta/revision-bad.rs#foo

test result: FAILED. 1 passed; 1 failed; 0 ignored; 0 measured; 17696 filtered out; finished in 206.56ms

Here are the logs:

• Trimmed: https://paste.ee/p/ZwD2q
• Full: https://paste.ee/p/z8Vnq

It feels like the test harness is failing to detect the panic - you can see in stderr that the panic occurs as expected, but the test asserts that it didn't! Oddly enough, revision-bad.rs#bar is detected correctly.

• rustc --version --verbose

  
  barrett@farts ~/D/p/c/rust (master)> rustc +stage0 --version --verbose
  rustc 1.82.0-beta.4 (8c27a2ba6 2024-09-21)
  binary: rustc
  commit-hash: 8c27a2ba6b21f3406a51118643080f0591949827
  commit-date: 2024-09-21
  host: x86_64-unknown-linux-gnu
  release: 1.82.0-beta.4
  LLVM version: 19.1.0
  
  barrett@farts ~/D/p/c/rust (master)> rustc +stage1 --version --verbose
  rustc 1.83.0-dev
  binary: rustc
  commit-hash: unknown
  commit-date: unknown
  host: x86_64-unknown-linux-gnu
  release: 1.83.0-dev
  LLVM version: 19.1.0
  

• System info
• set -L

  
  barrett@farts ~/D/p/c/rust (master)> set -L
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  barrett@farts ~/D/p/c/rust (master)> 
  

[jieyouxu]

It feels like the test harness is failing to detect the panic - you can see in stderr that the panic occurs as expected, but the test asserts that it didn't! Oddly enough, revision-bad.rs#bar is detected correctly.

It's actually because your username barrett contains bar, which the foo revision is explicitly checking to make sure that it is not present in test run stderr. But that is present in the panic backtrace of test stderr because the panic backtrace contains a path including your username. In #131579 I'm fixing it by remapping the path prefix so the panic backtrace paths are predictable and does not include username info or intermediate folders.