Commits on Jan 26, 2017

1. Point to immutable arg/fields when trying to use as &mut …

   Point to immutable borrow arguments and fields when trying to use them as
   mutable borrows. Add label to primary span on "cannot borrow as mutable"
   errors.
   
   Present the following output when trying to access an immutable borrow's
   field as mutable:
   
   ```
   error[E0389]: cannot borrow data mutably in a `&` reference
     --> $DIR/issue-38147-1.rs:27:9
      |
   26 | fn f(&self) {
      |      -----  use `&mut self` here to make mutable
   27 |     f.s.push('x');
      |     ^^^ assignment into an immutable reference
   ```
   
   And the following when trying to access an immutable struct field as mutable:
   
   ```
   error: cannot borrow immutable borrowed content `*self.s` as mutable
     --> $DIR/issue-38147-3.rs:17:9
      |
   12 |     s: &'a String
      |     ------------- use `&'a mut String` here to make mutable
   ...|
   16 |     fn f(&self) {
      |          -----  use `&mut self` here to make mutable
   17 |         self.s.push('x');
      |         ^^^^^^ cannot borrow as mutable
   ```

   

   estebank committed Jan 26, 2017
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