tests/cases/compiler/typeParameterHasSelfAsConstraint.ts(1,14): error TS2313: Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
tests/cases/compiler/typeParameterHasSelfAsConstraint.ts(2,12): error TS2322: Type 'T' is not assignable to type 'number'.


==== tests/cases/compiler/typeParameterHasSelfAsConstraint.ts (2 errors) ====
    function foo<T extends T>(x: T): number {
                 ~~~~~~~~~~~
!!! error TS2313: Constraint of a type parameter cannot reference any type parameter from the same type parameter list.
        return x;
               ~
!!! error TS2322: Type 'T' is not assignable to type 'number'.
    }