switch_case_completes_normally

The 'case' shouldn't complete normally.

The analyzer produces this diagnostic when the statements following a case label in a switch statement could fall through to the next case or default label.

The following code produces this diagnostic because the case label with a value of zero (0) falls through to the default statements:

void f(int a) {
  switch (a) {
    case 0:
      print(0);
    default:
      return;
  }
}

Change the flow of control so that the case won't fall through. There are several ways that this can be done, including adding one of the following at the end of the current list of statements:

• a return statement,
• a throw expression,
• a break statement,
• a continue, or
• an invocation of a function or method whose return type is Never.

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.