error: redundant pattern matching, consider using `is_ok()`
  --> $DIR/if_let_redundant_pattern_matching.rs:19:12
   |
19 |     if let Ok(_) = Ok::<i32, i32>(42) {}
   |     -------^^^^^------------------------ help: try this: `if Ok::<i32, i32>(42).is_ok()`
   |
   = note: `-D clippy::if-let-redundant-pattern-matching` implied by `-D warnings`

error: redundant pattern matching, consider using `is_err()`
  --> $DIR/if_let_redundant_pattern_matching.rs:21:12
   |
21 |       if let Err(_) = Err::<i32, i32>(42) {
   |  _____-      ^^^^^^
22 | |     }
   | |_____- help: try this: `if Err::<i32, i32>(42).is_err()`

error: redundant pattern matching, consider using `is_none()`
  --> $DIR/if_let_redundant_pattern_matching.rs:24:12
   |
24 |       if let None = None::<()> {
   |  _____-      ^^^^
25 | |     }
   | |_____- help: try this: `if None::<()>.is_none()`

error: redundant pattern matching, consider using `is_some()`
  --> $DIR/if_let_redundant_pattern_matching.rs:27:12
   |
27 |       if let Some(_) = Some(42) {
   |  _____-      ^^^^^^^
28 | |     }
   | |_____- help: try this: `if Some(42).is_some()`

error: aborting due to 4 previous errors