==== tests/cases/conformance/classes/classDeclarations/classHeritageSpecification/classExtendsEveryObjectType.ts (7 errors) ====
    interface I {
        foo: string;
    }
    class C extends I { } // error
                    ~
!!! A class may only extend another class.
    
    class C2 extends { foo: string; } { } // error
                     ~
!!! Identifier expected.
    var x: { foo: string; }
    class C3 extends x { } // error
                     ~
!!! Cannot find name 'x'.
    
    module M { export var x = 1; }
    class C4 extends M { } // error
                     ~
!!! Cannot find name 'M'.
    
    function foo() { }
    class C5 extends foo { } // error
                     ~~~
!!! Cannot find name 'foo'.
    
    class C6 extends []{ } // error
                     ~
!!! Identifier expected.
                       ~
!!! ';' expected.