Specify when type parameter shadows primitive type

When a type parameter shadows a primitive type, the error message
was non obvious. For example, given the file `file.rs`:

```rust
trait Parser<T> {
    fn parse(text: &str) -> Option<T>;
}

impl<bool> Parser<bool> for bool {
    fn parse(text: &str) -> Option<bool> {
        Some(true)
    }
}

fn main() {
    println!("{}", bool::parse("ok").unwrap_or(false));
}
```

The output was:

```bash
% rustc file.rs
error[E0308]: mismatched types
 --> file.rs:7:14
  |
7 |         Some(true)
  |              ^^^^ expected type parameter, found bool
  |
  = note: expected type `bool`
  = note:    found type `bool`

error: aborting due to previous error
```

We now show extra information about the type:

```bash
% rustc file.rs
error[E0308]: mismatched types
 --> file.rs:7:14
  |
7 |         Some(true)
  |              ^^^^ expected type parameter, found bool
  |
  = note: expected type `bool` (type parameter)
  = note:    found type `bool` (bool)

error: aborting due to previous error
```

Fixes #35030

src/test/ui/mismatched_types/issue-35030.rs

@@ -0,0 +1,25 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// rustc-env:RUST_NEW_ERROR_FORMAT
+
+trait Parser<T> {
+    fn parse(text: &str) -> Option<T>;
+}
+
+impl<bool> Parser<bool> for bool {
+    fn parse(text: &str) -> Option<bool> {
+        Some(true)
+    }
+}
+
+fn main() {
+    println!("{}", bool::parse("ok").unwrap_or(false));
+}

src/test/ui/mismatched_types/issue-35030.stderr

@@ -0,0 +1,11 @@
+error[E0308]: mismatched types
+  --> $DIR/issue-35030.rs:19:14
+   |
+19 |         Some(true)
+   |              ^^^^ expected type parameter, found bool
+   |
+   = note: expected type `bool` (type parameter)
+   = note:    found type `bool` (bool)
+
+error: aborting due to previous error
+