E0409 needs to be updated to new format

[sophiajt]

From: src/test/compile-fail/E0409.rs

E0409 needs a span_label, updating it from:

error[E0409]: variable `y` is bound with different mode in pattern #2 than in pattern #1
  --> src/test/compile-fail/E0409.rs:15:23
   |
15 |         (0, ref y) | (y, 0) => {} //~ ERROR E0409
   |                       ^

To:

error[E0409]: variable `y` is bound with different mode in pattern #2 than in pattern #1
  --> src/test/compile-fail/E0409.rs:15:23
   |
15 |         (0, ref y) | (y, 0) => {} //~ ERROR E0409
   |                       ^ bound in different ways

Bonus: add the span_label for the previous binding:

error[E0409]: variable `y` is bound with different mode in pattern #2 than in pattern #1
  --> src/test/compile-fail/E0409.rs:15:23
   |
15 |         (0, ref y) | (y, 0) => {} //~ ERROR E0409
   |             -----     ^ bound in different ways
   |             |
   |             first binding

[mikhail-m1]

I've managed to solve bonus like this:

  --> src/test/compile-fail/E0409.rs:15:23
15 |         (0, ref y) | (y, 0) => {} //~ ERROR E0409
   |                 -     ^ bound in different ways
   |                 |
   |                 first binding

Is it OK?

[sophiajt]

Yes, underlining the name of the binding works just fine.

  --> src/test/compile-fail/E0409.rs:15:23`
   |
15 |         (0, ref y) | (y, 0) => {} //~ ERROR E0409
   |                 -     ^ bound in different ways
   |                 |
   |                 first binding