Commits on Jan 3, 2023

1. fix: warnings for cloning references …

   In tokio-rs#1674, it was pointed out that `axum-macros` causes some `clippy`
   warnings (and some `rustc` lints to fail) as the `FromRef` macro
   generates code which clones reference types unnecessarily.
   
   This seems to be when generating the body of the trait implementation,
   but since we have the type information from `syn` at that point it's
   relatively simple to resolve these.
   
   This change:
   * Avoids using `.clone` if we are generating the implementation for a
     reference type field
   * Adds a simple UI test to ensure this compiles with the `rustc` lint
     set to deny
   
   Fixes tokio-rs#1674.

   

   alexander-jackson committed Jan 3, 2023
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