Suggest == to wrong assign expr

[TaKO8Ki]

Given the following code:

fn main() {
    let x = 3;
    let y = 3;
    if x == x && y = y {
        println!("{}", x);
    }
}

Current output is:

error[E0308]: mismatched types
 --> src/main.rs:4:18
  |
4 |     if x == x && y = y {
  |                  ^ expected `bool`, found integer

error[E0308]: mismatched types
 --> src/main.rs:4:8
  |
4 |     if x == x && y = y {
  |        ^^^^^^^^^^^^^^^ expected `bool`, found `()`

This adds a suggestion:

error[E0308]: mismatched types
 --> src/main.rs:6:18
  |
6 |     if x == x && y = y {
  |                  ^ expected `bool`, found integer

error[E0308]: mismatched types
 --> src/main.rs:6:8
  |
6 |     if x == x && y = y {
  |        ^^^^^^^^^^^^^^^ expected `bool`, found `()`
  |
+ help: you might have meant to compare for equality
+   |
+ 6 |     if x == x && y == y {
+   |                     +

And this fixes a part of #97469

[TaKO8Ki]

r? compiler

[rust-highfive]

r? @estebank

(rust-highfive has picked a reviewer for you, use r? to override)

[estebank]

@bors r+

[bors]

📌 Commit b7c42c5 has been approved by estebank

It is now in the queue for this repository.