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avoid-contradictory-expressions

added in: 1.14.0
warning

Warns when several conditions contradict each other.

Example​

❌ Bad:

void fn() {
  final num = 1;
  final anotherNum = 2;

  if (anotherNum == 3 && anotherNum == 4) {} // LINT
  if (anotherNum < 4 && anotherNum > 4) {} // LINT
  if (anotherNum == 2 && anotherNum != 2) {} // LINT
  if (anotherNum == num && anotherNum != num) {} // LINT
}

✅ Good:

void fn() {
  final num = 1;
  final anotherNum = 2;

  if (anotherNum == 3 || anotherNum == 4) {}
  if (anotherNum < 4 && anotherNum > 2) {}
  if (anotherNum == 2) {}
  if (anotherNum == num) {}
}