tests/cases/compiler/nullableFunctionError.ts(1,1): error TS2721: Cannot invoke an object which is possibly 'null'.
tests/cases/compiler/nullableFunctionError.ts(2,1): error TS2722: Cannot invoke an object which is possibly 'undefined'.
tests/cases/compiler/nullableFunctionError.ts(4,1): error TS2723: Cannot invoke an object which is possibly 'null' or 'undefined'.


==== tests/cases/compiler/nullableFunctionError.ts (3 errors) ====
    null();
    ~~~~
!!! error TS2721: Cannot invoke an object which is possibly 'null'.
    undefined();
    ~~~~~~~~~
!!! error TS2722: Cannot invoke an object which is possibly 'undefined'.
    let f: null | undefined;
    f();
    ~
!!! error TS2723: Cannot invoke an object which is possibly 'null' or 'undefined'.
    