tests/ui/lint/unused/unused-parens-false-positive-issue-143653.rs

//@ run-rustfix

#![deny(unused_parens)]
#![allow(warnings)]
trait MyTrait {}

fn foo(_: Box<dyn FnMut(&mut u32) -> &mut (dyn MyTrait) + Send + Sync>) {}

//~v ERROR unnecessary parentheses around type
fn bar(_: Box<dyn FnMut(&mut u32) -> &mut (dyn MyTrait)>) {}

fn main() {}