Made the clone_from implementation for ~T reuse the T itself if possible
#13008
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possible by also calling `clone_from` on it. In general, `Clone` implementors that overwrite `clone_from` should try to to use it recursivly for substructures.
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[`missing_const_for_fn`]: fix suggestions for fn with abi that requires `const_extern_fn` feature closes: rust-lang#13008 --- changelog: [`missing_const_for_fn`]: fix suggestions for fn with abi that requires `const_extern_fn` feature.
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...by also calling
clone_fromon it.In general,
Cloneimplementors that overwriteclone_fromshould try to to use it recursively for substructures.