Can't #[bench] a function named b #148275
Description
#![feature(test)] extern crate test; #[bench] fn b(_: &mut test::bench::Bencher) {}I should be able to run this as a benchmark, but I got the following error:
error[E0308]: mismatched types --> src/lib.rs:6:1 | 5 | #[bench] | -------- in this attribute macro expansion 6 | fn b(_: &mut test::bench::Bencher) {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | | | expected `&mut Bencher`, found `TestDescAndFn` | expected due to this | constant defined here | `b` is interpreted as a constant, not a new binding | help: introduce a new binding instead: `other_b` error[E0308]: mismatched types --> src/lib.rs:6:1 | 5 | #[bench] | -------- in this attribute macro expansion 6 | fn b(_: &mut test::bench::Bencher) {} | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | | | expected `&mut Bencher`, found `TestDescAndFn` | arguments to this function are incorrect | note: function defined here --> src/lib.rs:6:4 | 6 | fn b(_: &mut test::bench::Bencher) {} | ^ ---------------------------- For more information about this error, try `rustc --explain E0308`. It seems that the macro expansion of #[bench] has a name collision with a variable named b.
rust/compiler/rustc_builtin_macros/src/test.rs
Lines 210 to 218 in 292be5c
Meta
Reproducible on the playground with version 1.93.0-nightly (2025-10-28 278a90913daf77077910) (click on the three dots on top left -> "test")
Metadata
Metadata
Assignees
Labels
Type
Projects
Status