feature request for functions declared in methods

[DartBot]

This issue was originally filed by @bp74

---

What steps will reproduce the problem?

void main() {
  void test1() {
    test2();
  }
  void test2() {
  }
  test1();
}

What is the expected output? What do you see instead?

This code does not compile and i don't even know if it would be correct to do so. The first function calls the function below. From a programmer standpoint it would be nice if this would work like it does with methods.

[iposva-google]

Added Area-Language, Triaged labels.

[gbracha]

Added Duplicate label.
Marked as being merged into #5339.