==== tests/cases/compiler/functionOverloadAmbiguity1.ts (1 errors) ====
    function callb(lam: (l: number) => void );
    function callb(lam: (n: string) => void );
    function callb(a) { }
    callb((a) => { a.length; } ); // error, chose first overload
                     ~~~~~~
!!! Property 'length' does not exist on type 'number'.
    
    function callb2(lam: (n: string) => void );
    function callb2(lam: (l: number) => void );
    function callb2(a) { }
    callb2((a) => { a.length; } ); // ok, chose first overload