unnecessary_final

Local variables should not be marked as 'final'.

The analyzer produces this diagnostic when a local variable is marked as being final.

The following code produces this diagnostic because the local variable c is marked as being final:

void f(int a, int b) {
  final c = a + b;
  print(c);
}

If the variable doesn't have a type annotation, then replace the final with var:

void f(int a, int b) {
  var c = a + b;
  print(c);
}

If the variable has a type annotation, then remove the final modifier:

void f(int a, int b) {
  int c = a + b;
  print(c);
}