183ef048f6
10823: fix: better `Fn` traits formatting r=jonas-schievink a=veber-alex This makes it so formatting `Fn` traits properly handles: 1. An `Fn` trait with only a single argument -> removes the trailing comma. 2. An `Fn` trait which returns nothing (an empty tuple) -> don't show `-> ()` as the return type. before:  after:  Co-authored-by: Alex Veber <alexveber@gmail.com>
rust-analyzer is a modular compiler frontend for the Rust language. It is a part of a larger rls-2.0 effort to create excellent IDE support for Rust.
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