unused_local_variable

The value of the local variable '{0}' isn't used.

The analyzer produces this diagnostic when a local variable is declared but never read, even if it's written in one or more places.

The following code produces this diagnostic because the value of count is never read:

void main() {
  int count = 0;
}

If the variable isn't needed, then remove it.

If the variable was intended to be used, then add the missing code.