Types reversed when using ref

[antoyo]

Hello.
The mismatched types error message shows the types in the wrong positions (they are reversed) when using ref.
For instance, this code:

fn main() {
    let var = 10i32;
    let ref string: String = var;
}

This shows the following message:

12 |     let ref string: String = var;
   |                              ^^^ expected i32, found struct `std::string::String`
   |
   = note: expected type `i32`
              found type `std::string::String`

In my opinion, the right message should be:

12 |     let ref string: String = var;
   |                              ^^^ expected struct `std::string::String`, found i32
   |
   = note: expected type `std::string::String`
              found type `i32`

(which is the message we actually see without ref)

This happens on both stable and nightly.
Thanks to fix this issue.

[antoyo]

cc @GuillaumeGomez