==== tests/cases/conformance/types/objectTypeLiteral/callSignatures/stringLiteralTypesInImplementationSignatures2.ts (12 errors) ====
    // String literal types are only valid in overload signatures
    
    function foo(x: any);
    function foo(x: 'hi') { }
    ~~~~~~~~~~~~~~~~~~~~~~~~~
!!! A signature with an implementation cannot use a string literal type.
    
    class C {
        foo(x: string);
        foo(x: 'hi') { }
        ~~~~~~~~~~~~~~~~
!!! A signature with an implementation cannot use a string literal type.
    }
    
    interface I {
        (x: 'a');
        ~~~~~~~~~
!!! Specialized overload signature is not assignable to any non-specialized signature.
        (x: 'hi');
        ~~~~~~~~~~
!!! Specialized overload signature is not assignable to any non-specialized signature.
        foo(x: 'a', y: 'a');
        ~~~~~~~~~~~~~~~~~~~~
!!! Specialized overload signature is not assignable to any non-specialized signature.
        foo(x: 'hi', y: 'hi');
        ~~~~~~~~~~~~~~~~~~~~~~
!!! Specialized overload signature is not assignable to any non-specialized signature.
    }
    
    var a: {
        (x: 'hi');
        ~~~~~~~~~~
!!! Specialized overload signature is not assignable to any non-specialized signature.
        (x: 'a');
        ~~~~~~~~~
!!! Specialized overload signature is not assignable to any non-specialized signature.
        foo(x: 'hi');
        ~~~~~~~~~~~~~
!!! Specialized overload signature is not assignable to any non-specialized signature.
        foo(x: 'a');
        ~~~~~~~~~~~~
!!! Specialized overload signature is not assignable to any non-specialized signature.
    }
    
    var b = {
        foo(x: 'hi') { },
        ~~~~~~~~~~~~~~~~
!!! A signature with an implementation cannot use a string literal type.
        foo(x: 'a') { },
        ~~~
!!! Duplicate identifier 'foo'.
    }