==== tests/cases/compiler/classExtendsInterface.ts (2 errors) ====
    interface Comparable {}
    class A extends Comparable {}
                    ~~~~~~~~~~
!!! A class may only extend another class.
    class B implements Comparable {}
     
    interface Comparable2<T> {}
    class A2<T> extends Comparable2<T> {}
                        ~~~~~~~~~~~~~~
!!! A class may only extend another class.
    class B2<T> implements Comparable2<T> {}