==== tests/cases/compiler/fuzzy.ts (3 errors) ====
    module M {
        export interface I {
            works:()=>R;
            alsoWorks:()=>R;
            doesntWork:()=>R;
        }
    
        export interface R {
            anything:number;
            oneI:I;
        }
    
        export class C implements I {
                     ~
!!! Class 'C' incorrectly implements interface 'I':
!!!   Property 'alsoWorks' is missing in type 'C'.
            constructor(public x:number) {
            }
            works():R {
                return <R>({ anything: 1 });
            }
    
            doesntWork():R {
                return { anything:1, oneI:this };
                       ~~~~~~~~~~~~~~~~~~~~~~~~~
!!! Type '{ anything: number; oneI: C; }' is not assignable to type 'R':
!!!   Types of property 'oneI' are incompatible:
!!!     Type 'C' is not assignable to type 'I'.
            }
    
            worksToo():R {
                return <R>({ oneI: this });
                       ~~~~~~~~~~~~~~~~~~~
!!! Neither type 'R' nor type '{ oneI: C; }' is assignable to the other.
            }
        }
    }