Auto merge of #37447 - estebank:non-duplicate-definition-error, r=nrc

Auto merge of #37447 - estebank:non-duplicate-definition-error, r=nrc

Show one error for duplicated type definitions

For the following code:

``` rustc
struct Bar;
struct Bar;

fn main () {
}
```

show

``` nocode
error[E0428]: a type named `Bar` has already been defined in this module
  --> src/test/compile-fail/E0428.rs:12:1
   |
11 | struct Bar;
   | ----------- previous definition of `Bar` here
12 | struct Bar;
   | ^^^^^^^^^^^

error: aborting due to previous error
```

instead of

``` nocode
error[E0428]: a type named `Bar` has already been defined in this module
  --> src/test/compile-fail/E0428.rs:12:1
   |
11 | struct Bar;
   | ----------- previous definition of `Bar` here
12 | struct Bar;
   | ^^^^^^^^^^^

error[E0428]: a value named `Bar` has already been defined in this module
  --> src/test/compile-fail/E0428.rs:12:1
   |
11 | struct Bar;
   | ----------- previous definition of `Bar` here
12 | struct Bar;
   | ^^^^^^^^^^^

error: aborting due to 2 previous errors
```

Fixes #35767.