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Rollup merge of #152162 - chenyukang:yukang-fix-152064-unsized-closure-return, r=petrochenkov
Suggest returning a reference for unsized place from a closure
Fixes rust-lang/rust#152064
There are 3 similar note:
`the size for values of type str cannot be known at compilation time`
for different spans, maybe need more work to remove some of them.
This PR only adds a suggestion for using a reference.
