error: this `if` branch is empty
  --> $DIR/needless_if.rs:30:5
   |
LL |     if (true) {}
   |     ^^^^^^^^^^^^ help: you can remove it
   |
   = note: `-D clippy::needless-if` implied by `-D warnings`

error: this `if` branch is empty
  --> $DIR/needless_if.rs:32:5
   |
LL |     if no_side_effects() {}
   |     ^^^^^^^^^^^^^^^^^^^^^^^ help: you can remove it: `no_side_effects();`

error: this `if` branch is empty
  --> $DIR/needless_if.rs:34:5
   |
LL |     if has_side_effects(&mut x) {}
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: you can remove it: `has_side_effects(&mut x);`

error: this `if` branch is empty
  --> $DIR/needless_if.rs:40:5
   |
LL | /     if {
LL | |         return;
LL | |     } {}
   | |________^
   |
help: you can remove it
   |
LL ~     {
LL +         return;
LL +     };
   |

error: aborting due to 4 previous errors