dont suggest changing the mutability of a borrow inside a macro the suggestion rewrote the borrow where it was written. for a borrow coming from a macro body that is the macro definition rather than the call site, and for a macro from another crate a file the user cannot edit. it was machine applicable so rustfix would apply it and a macro invoked at more than one call site could stop compiling. gate it on can_be_used_for_suggestions so those cases fall through to the existing note that the trait is implemented for the mutable borrow but not the shared one.
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