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Spurious failure in HeapFree on Windows #37395

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@alexcrichton

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@alexcrichton

https://buildbot.rust-lang.org/builders/auto-win-gnu-32-opt-rustbuild/builds/2829/steps/test/logs/stdio
https://gist.github.com/alexcrichton/9f36ff87645b87d02a0ee6d302d5798e

doc tests for: C:\bot\slave\auto-win-gnu-32-opt-rustbuild\build\src/doc\nomicon\repr-rust.md

running 7 tests
test _4 ... ignored
test _6 ... FAILED
test _0 ... ok
test _3 ... ok
test _1 ... ok
test _5 ... ok
test _2 ... ok

failures:

---- _6 stdout ----
    thread '_6' panicked at 'assertion failed: err != 0', C:\bot\slave\auto-win-gnu-32-opt-rustbuild\build\src\liballoc_system\lib.rs:233
note: Run with `RUST_BACKTRACE=1` for a backtrace.
thread '_6' panicked at 'couldn't compile the test', C:\bot\slave\auto-win-gnu-32-opt-rustbuild\build\src\librustdoc\test.rs:283


failures:
    _6

test result: FAILED. 5 passed; 1 failed; 1 ignored; 0 measured

where the relevant line is here:

debug_assert!(err != 0);

This is... terrifying!

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    A-spuriousArea: Spurious failures in builds (spuriously == for no apparent reason)O-windowsOperating system: Windows

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