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Further enhance `needless_borrow`, mildly refactor `redundant_clone` This PR does the following: * Moves some code from `redundant_clone` into a new `clippy_utils` module called `mir`, and wraps that code in a function called `dropped_without_further_use`. * Relaxes the "is copyable" condition condition from #9136 by also suggesting to remove borrows from values dropped without further use. The changes involve the just mentioned function. * Separates `redundant_clone` into modules. Strictly speaking, the last bullet is independent of the others. `redundant_clone` is somewhat hairy, IMO. Separating it into modules makes it slightly less so, by helping to delineate what depends upon what. I've tried to break everything up into digestible commits. r? `@Jarcho` (`@Jarcho` I hope you don't mind.) changelog: continuation of #9136 |
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