rustfmt eats attributes while formatting functions with variadic parameters #6561

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mejrs opened this issue May 11, 2025 · 0 comments

mejrs commented May 11, 2025 •

edited

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If you format...

#[allow()]
unsafe extern "C" {
    #[allow()]
    pub fn foo(#[allow()] arg: *mut u8, #[allow()]...);
}

Then it will format into

#[allow()]
unsafe extern "C" {
    #[allow()]
    pub fn foo(#[allow()] arg: *mut u8, ...);
}

(The choice of attribute seems irrelevant, I've used allow because it compiles in any position).

Note that this position is explicitly documented at https://doc.rust-lang.org/nightly/reference/attributes.html#r-attributes.allowed-position

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