5d32fd1b06
The warning can be reproduced with 1.63 but not with 1.64. $ rustc +1.63 tests/ui/lint/unused/const-local-var.rs warning: constant `F` is never used --> tests/ui/lint/unused/const-local-var.rs:14:9 | 14 | const F: i32 = 2; | ^^^^^^^^^^^^^^^^^ | = note: `#[warn(dead_code)]` on by default $ rustc +1.64 tests/ui/lint/unused/const-local-var.rs Add a regression test to prevent the problem from re-appearing.