ICE during build of `curve25519-dalek` - index out of bounds

[maxfunke]

Log in CI while cargo build

Meta

rustc 1.75.0 (82e1608df 2023-12-21) running on x86_64-pc-windows-msvc

Error output

thread 'rustc' panicked at compiler\rustc_metadata\src\rmeta\decoder.rs:962:10:
index out of bounds: the len is 0 but the index is 0

note: rustc 1.75.0 (82e1608df 2023-12-21) running on x86_64-pc-windows-msvc
note: compiler flags: --crate-type rlib -C opt-level=3 -C embed-bitcode=no
note: some of the compiler flags provided by cargo are hidden
query stack during panic:
#0 [resolver_for_lowering] getting the resolver for lowering
end of query stack
   Compiling darling_core v0.20.3
error: could not compile `curve25519-dalek` (lib)

The error is not reproducable though.

[saethlin]

I suspect this is another out-of-disk crash, that should hopefully be fixed by all my PRs, the last of which ships in 1.77. It's definitely not an incremental compilation issue.

[saethlin]

I think the root cause of this issue was rustc incorrectly handling/reporting I/O errors. I've landed a number of PRs to address the problem; the most recent of those is #119510 which is now part of the latest stable toolchain, 1.77. Therefore, even though I have not reproduced exactly what you've reported here, I'm going to close this because I am reasonably confident that this bug is now fixed on stable.

Of course it is possible that I am wrong and the bug you've reported here is not fixed. If you happen to run into problems like this in 1.77 or later please do not hesitate to open a new issue.