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A-reproducibilityArea: Reproducible / deterministic buildsArea: Reproducible / deterministic buildsC-bugCategory: This is a bug.Category: This is a bug.T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.regression-from-stable-to-nightlyPerformance or correctness regression from stable to nightly.Performance or correctness regression from stable to nightly.
Description
I tried this code:
pub fn main() { break rust }
command:
RUST_BACKTRACE=0 RUSTC_ICE=0 rustc a.rs
I expected to see this happen:
Equal output on all runs (current behavior on stable 1.89.0 )
Instead, this happened:
thread id that changes every run
--- 1 2025-08-15 08:31:33.671734318 +0200
+++ 2 2025-08-15 08:31:34.932738329 +0200
@@ -21,7 +21,7 @@
= note: rustc 1.91.0-nightly (898aff704 2025-08-14) running on x86_64-unknown-linux-gnu
-thread 'rustc' (3427246) panicked at compiler/rustc_hir_typeck/src/lib.rs:549:10:
+thread 'rustc' (3427309) panicked at compiler/rustc_hir_typeck/src/lib.rs:549:10:
Box<dyn Any>
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
Meta
since #115746
rustc --version --verbose
:
rustc 1.91.0-nightly (898aff704 2025-08-14)
binary: rustc
commit-hash: 898aff704d6f0d00343f21d31b8b9bfac8e43007
commit-date: 2025-08-14
host: x86_64-unknown-linux-gnu
release: 1.91.0-nightly
LLVM version: 21.1.0
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Labels
A-reproducibilityArea: Reproducible / deterministic buildsArea: Reproducible / deterministic buildsC-bugCategory: This is a bug.Category: This is a bug.T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.regression-from-stable-to-nightlyPerformance or correctness regression from stable to nightly.Performance or correctness regression from stable to nightly.