Commits on Mar 24, 2017

1. Point to definition when modifying field of immutable variable …

   Given a file
   
   ```rust
   struct S {
       x: i32,
   }
   fn foo() {
       let s = S { x: 42 };
       s.x += 1;
   }
   fn bar(s: S) {
       s.x += 1;
   }
   ```
   
   Provide the following output:
   
   ```rust
   error: cannot assign to immutable field `s.x`
    --> $DIR/issue-35937.rs:16:5
     |
   5 |     let s = S { x: 42 };
     |         - consider changing this to `mut s`
   6 |     s.x += 1;
     |     ^^^^^^^^ cannot mutably borrow immutable field
   
   error: cannot assign to immutable field `s.x`
    --> $DIR/issue-35937.rs:20:5
     |
   8 | fn bar(s: S) {
     |        - consider changing this to `mut s`
   9 |     s.x += 1;
     |     ^^^^^^^^ cannot mutably borrow immutable field
   ```
   
   Follow up to rust-lang#40445. Fix rust-lang#35937.

   

   estebank committed Mar 24, 2017
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