Public bug reported:
This bug is blocking the rust-defaults transition.
Currently, rust-tracing-core assumes that Rust niche optimization[1] remains the
same, even though Rust makes no such guarantee. As of Rust 1.97, this hardcoded
assumption is no longer true, meaning that the
metadata::tests::level_filter_reprs
test breaks[2]:
167s ---- metadata::tests::level_filter_reprs stdout ----
167s
167s thread 'metadata::tests::level_filter_reprs' (5315) panicked at
src/metadata.rs:1119:13:
167s assertion `left == right` failed: repr changed for LevelFilter::OFF
167s left: 5
167s right: 18446744073709551615
167s stack backtrace:
167s 0: __rustc::rust_begin_unwind
167s at /usr/src/rustc-1.97.1/library/std/src/panicking.rs:689:5
167s 1: core::panicking::panic_fmt
167s at /usr/src/rustc-1.97.1/library/core/src/panicking.rs:80:14
167s 2: core::panicking::assert_failed_inner
167s at /usr/src/rustc-1.97.1/library/core/src/panicking.rs:434:23
167s 3: core::panicking::assert_failed::<usize, usize>
167s at /usr/src/rustc-1.97.1/library/core/src/panicking.rs:394:5
167s 4: tracing_core::metadata::tests::level_filter_reprs
167s at ./src/metadata.rs:1119:13
167s 5: tracing_core::metadata::tests::level_filter_reprs::{closure#0}
167s at ./src/metadata.rs:1102:28
167s 6: <tracing_core::metadata::tests::level_filter_reprs::{closure#0} as
core::ops::function::FnOnce<()>>::call_once
167s at
/usr/src/rustc-1.97.1/library/core/src/ops/function.rs:250:5
167s 7: <fn() -> core::result::Result<(), alloc::string::String> as
core::ops::function::FnOnce<()>>::call_once
167s at
/usr/src/rustc-1.97.1/library/core/src/ops/function.rs:250:5
167s note: Some details are omitted, run with `RUST_BACKTRACE=full` for a
verbose backtrace.
[1]: https://www.0xatticus.com/posts/understanding_rust_niche/
[2]:
https://autopkgtest.ubuntu.com/results/autopkgtest-stonking/stonking/amd64/r/rust-tracing-core/20260912_123714_a8bc3@/log.gz
** Affects: rust-tracing-core (Ubuntu)
Importance: Undecided
Assignee: Max Gilmour (maxgmr)
Status: In Progress
** Tags: update-excuse
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https://bugs.launchpad.net/bugs/2167368
Title:
Hardcoded niche optimization assumption incorrect for Rust 1.97+
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