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Rust: Make function trait syntax without return type default to unit #21139

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Rust: Make function trait syntax without return type default to unit #21139

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@paldepind paldepind commented Jan 9, 2026 •
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In the special FnOnce(Args) -> ReturnType syntax, the return type can be omitted which is equivalent to specifying () as the return type.

I moved the handling of this from getTypeMentionForTypeParameter to getTypeForTypeParameterAt since we now have a case where a suitable type mention is present.

@github-actions github-actions bot added the Rust Pull requests that update Rust code label Jan 9, 2026
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