==== tests/cases/conformance/types/typeParameters/typeParameterLists/typeParameterDirectlyConstrainedToItself.ts (10 errors) ====
    // all of the below should be errors
    
    class C<T extends T> { } 
            ~~~~~~~~~~~
!!! Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
    class C2<T, U extends U> { } 
                ~~~~~~~~~~~
!!! Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
    
    interface I<T extends T> { }
                ~~~~~~~~~~~
!!! Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
    interface I2<T, U extends U> { }
                    ~~~~~~~~~~~
!!! Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
    
    function f<T extends T>() { }
               ~~~~~~~~~~~
!!! Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
    function f2<T, U extends U>() { }
                   ~~~~~~~~~~~
!!! Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
    
    var a: {
        <T extends T>(): void;
         ~~~~~~~~~~~
!!! Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
        <T, U extends U>(): void;
            ~~~~~~~~~~~
!!! Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
    }
    
    var b = <T extends T>() => { }
             ~~~~~~~~~~~
!!! Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
    var b2 = <T, U extends U>() => { }
                 ~~~~~~~~~~~
!!! Constraint of a type parameter cannot reference any type parameter from the same type parameter list.