The rule avoid_type_to_string is not working for me.

Here are the steps to reproduce:

1. dart --version
   Dart SDK version: 2.12.3 (stable) (Wed Apr 14 11:02:39 2021 +0200) on "windows_x64"

2. dart create --template package-simple example_lib

3. Replace content of analysis_options.yaml with the following:

linter:
  rules:
    avoid_type_to_string: true

4. Append the following to lib/example_lib.dart:

class A {}

void f() {
  A().runtimeType.toString();
}

5. dart analyze
   Expected result: a message regarding avoid_type_to_string
   Actual result: no issues found