case_block_not_terminated

The last statement of the 'case' should be 'break', 'continue', 'rethrow', 'return', or 'throw'.

The analyzer produces this diagnostic when the last statement in a case block isn't one of the required terminators: break, continue, rethrow, return, or throw.

The following code produces this diagnostic because the case block ends with an assignment:

void f(int x) {
  switch (x) {
    case 0:
      x += 2;
    default:
      x += 1;
  }
}

Add one of the required terminators:

void f(int x) {
  switch (x) {
    case 0:
      x += 2;
      break;
    default:
      x += 1;
  }
}

Unless stated otherwise, the documentation on this site reflects Dart 3.8.1. Page last updated on 2025-05-08. View source or report an issue.