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Allowing a lint fails on let binding. #51942

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Description

Example with cost_err:

fn main() {
    #[allow(const_err)]
    let _x = 42 / 0;
}
#[allow(const_err)]
fn main() {
    let _x = 42 / 0;
}

Expected: the same. Actual: warning in the first case.

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    A-attributesArea: Attributes (`#[…]`, `#![…]`)A-diagnosticsArea: Messages for errors, warnings, and lintsC-bugCategory: This is a bug.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

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