Commits on Nov 21, 2021

1. Fixes rust-lang#7915 …

   Fix shadow_same's positive false for async function's params:
   
   Example Code:
   ```rust
   #![deny(clippy::shadow_same)]
   
   pub async fn foo(_a: i32) {
   }
   ```
   Output:
   ```
   error: `_a` is shadowed by itself in `_a
   ```
   
   Hir:
   ```rust
   pub async fn foo(_a: i32)
    ->
        /*impl Trait*/ #[lang = "from_generator"](move |mut _task_context|
                                                      {
                                                          let _a = _a;
                                                          { let _t = { }; _t }
                                                      })
   ```
   
   Skip checking async function's params.
   
   changelog: Fix shadow_same's positive false for async function's params

   

   surechen committed Nov 21, 2021
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