==== tests/cases/conformance/statements/returnStatements/invalidReturnStatements.ts (6 errors) ====
    // all the following should be error
    function fn1(): number {  }
                    ~~~~~~
!!! A function whose declared type is neither 'void' nor 'any' must return a value or consist of a single 'throw' statement.
    function fn2(): string { }
                    ~~~~~~
!!! A function whose declared type is neither 'void' nor 'any' must return a value or consist of a single 'throw' statement.
    function fn3(): boolean { }
                    ~~~~~~~
!!! A function whose declared type is neither 'void' nor 'any' must return a value or consist of a single 'throw' statement.
    function fn4(): Date {  }
                    ~~~~
!!! A function whose declared type is neither 'void' nor 'any' must return a value or consist of a single 'throw' statement.
    function fn7(): any {  } // should be valid: any includes void
    
    interface I { id: number }
    class C implements I {
        id: number;
        dispose() {}
    }
    class D extends C {
        name: string;
    }
    function fn10(): D { return { id: 12 }; } 
                                ~~~~~~~~~~
!!! Type '{ id: number; }' is not assignable to type 'D':
!!!   Property 'name' is missing in type '{ id: number; }'.
    
    function fn11(): D { return new C(); }
                                ~~~~~~~
!!! Type 'C' is not assignable to type 'D':
!!!   Property 'name' is missing in type 'C'.