Commits on Sep 13, 2021

1. Highlight the const function if error happened because of a bound on … …

   …the impl block
   
   Currently, for the following code, the compiler produces the errors like the
   following error:
   ```rust
   struct Type<T>
   
   impl<T: Clone> Type<T> {
   	fn const f() {}
   }
   ```
   ```text
   error[E0658]: trait bounds other than `Sized` on const fn parameters are unstable
    --> ./test.rs:3:6
     |
   3 | impl<T: Clone> Type<T> {
     |      ^
     |
     = note: see issue rust-lang#57563 <rust-lang#57563> for more information
     = help: add `#![feature(const_fn_trait_bound)]` to the crate attributes to enable
   ```
   
   This can be confusing (especially to newcomers) since the error mentions
   "const fn parameters", but highlights only the impl.
   
   This commits adds function highlighting, changing the error to the following:
   
   ```text
   error[E0658]: trait bounds other than `Sized` on const fn parameters are unstable
    --> ./test.rs:3:6
     |
   3 | impl<T: Clone> Type<T> {
     |      ^
   4 |     pub const fn f() {}
     |     ---------------- function declared as const here
     |
     = note: see issue rust-lang#57563 <rust-lang#57563> for more information
     = help: add `#![feature(const_fn_trait_bound)]` to the crate attributes to enable
   ```

   

   WaffleLapkin committed Sep 13, 2021
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