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unused_label

Contents

The label '{0}' isn't used.

Description

#

The analyzer produces this diagnostic when a label that isn't used is found.

Example

#

The following code produces this diagnostic because the label loop isn't referenced anywhere in the method:

dart 
void f(int limit) {
  loop: for (int i = 0; i < limit; i++) {
    print(i);
  }
}

Common fixes

#

If the label isn't needed, then remove it:

dart 
void f(int limit) {
  for (int i = 0; i < limit; i++) {
    print(i);
  }
}

If the label is needed, then use it:

dart 
void f(int limit) {
  loop: for (int i = 0; i < limit; i++) {
    print(i);
    if (i != 0) {
      break loop;
    }
  }
}

Unless stated otherwise, the documentation on this site reflects Dart 3.9.2. Page last updated on 2025-9-1. View source or report an issue.