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feature : assist delegate impl This PR ( fixes #14386 ) introduces a new IDE assist that generates a trait impl for a struct that delegates a field. This is a draft because the current `ide_db::path_transform::PathTransform` produces some unwanted results when it deals with extern crates, an example of which I attach as a GIF. GIFs : 1. A general case ![14386-functional](https://github.com/rust-lang/rust-analyzer/assets/20956650/22114959-caa6-45ec-a154-b4b2f458f6b1) 2. A case where `ide_db::path_transform::PathTransform` fails to correctly resolve a property ( take `Allocator` as an example ) to its full path, thus causing an error to occur. ( Not to even mention that resolving this causes another error `use of unstable library feature 'allocator_api'` to occur ![14386-erroneous](https://github.com/rust-lang/rust-analyzer/assets/20956650/922ca715-594e-4168-a579-7c5c006f93aa) |
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