Fail to identify updates on final variables declared in default methods

interface Test {
  default void test() {
    final int x = 1;
    x = 2;
  } 
}

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
test.groovy: 4: The variable [x] is declared final but is reassigned
. At [4:5]  @ line 4, column 5.
       x = 2;
       ^

1 error