==== tests/cases/compiler/lastPropertyInLiteralWins.ts (3 errors) ====
    interface Thing {
        thunk: (str: string) => void;
    }
    function test(thing: Thing) {
        thing.thunk("str");
    }
    test({ // Should error, as last one wins, and is wrong type
        thunk: (str: string) => {},
        thunk: (num: number) => {}
        ~~~~~
!!! Duplicate identifier 'thunk'.
    });
    
    test({ // Should be OK.  Last 'thunk' is of correct type
         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        thunk: (num: number) => {},
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        thunk: (str: string) => {}
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        ~~~~~
!!! Duplicate identifier 'thunk'.
    });
    ~
!!! Argument of type '{ thunk: (num: number) => void; }' is not assignable to parameter of type 'Thing'.
!!!   Types of property 'thunk' are incompatible:
!!!     Type '(num: number) => void' is not assignable to type '(str: string) => void':
!!!       Types of parameters 'num' and 'str' are incompatible:
!!!         Type 'number' is not assignable to type 'string'.