override21.ts(5,14): error TS4113: This member cannot have an 'override' modifier because it is not declared in the base class 'A'.


==== override21.ts (1 errors) ====
    const foo = Symbol();
    class A { }
    
    class B extends A {
        override [foo]() { }
                 ~~~~~
!!! error TS4113: This member cannot have an 'override' modifier because it is not declared in the base class 'A'.
    }
    