Fix redundant_closure
false positive with closures has return type contains 'static
#13108
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Fix #13073 .
Please enable "ignore white-space change" settings in github UI for easy reviewing.
HACK: The third commit contains a hack to check if a type
T: 'static
whenfn() -> U where U: 'static
.I don't have a clean way to check for it.
changelog: [
redundant_closure
] Fix false positive with closures has return type contains'static