Idea (Quickfix): "Add todo!() to end of your function"

It would be nice if rust-analyzer provides a code action (quickfix) which adds todo!() when:

• No return sentence
• The function should return something (not -> ()), but it doesn't return anything

// Case 1: Should suggest, because the function looks like it's not completed
fn foo() -> String {
  doing_things();
  // ...
  // add todo!() here
}

// Case 2: Should not suggest, because it's more likely an user issue
fn foo() -> String {
  doing_things();

  return 42;
}

// Case 3: Should not suggest, because it's more likely an user issue
fn foo() -> String {
  doing_things();

  return;
}