=== tests/cases/compiler/typeInferenceReturnTypeCallback.ts ===
interface IList<A> {
>IList : Symbol(IList, Decl(typeInferenceReturnTypeCallback.ts, 0, 0))
>A : Symbol(A, Decl(typeInferenceReturnTypeCallback.ts, 0, 16))

    map<B>(f: (t: A) => B): IList<B>;
>map : Symbol(map, Decl(typeInferenceReturnTypeCallback.ts, 0, 20))
>B : Symbol(B, Decl(typeInferenceReturnTypeCallback.ts, 1, 8))
>f : Symbol(f, Decl(typeInferenceReturnTypeCallback.ts, 1, 11))
>t : Symbol(t, Decl(typeInferenceReturnTypeCallback.ts, 1, 15))
>A : Symbol(A, Decl(typeInferenceReturnTypeCallback.ts, 0, 16))
>B : Symbol(B, Decl(typeInferenceReturnTypeCallback.ts, 1, 8))
>IList : Symbol(IList, Decl(typeInferenceReturnTypeCallback.ts, 0, 0))
>B : Symbol(B, Decl(typeInferenceReturnTypeCallback.ts, 1, 8))
}

class Nil<C> implements IList<C>{
>Nil : Symbol(Nil, Decl(typeInferenceReturnTypeCallback.ts, 2, 1))
>C : Symbol(C, Decl(typeInferenceReturnTypeCallback.ts, 4, 10))
>IList : Symbol(IList, Decl(typeInferenceReturnTypeCallback.ts, 0, 0))
>C : Symbol(C, Decl(typeInferenceReturnTypeCallback.ts, 4, 10))

    map<D>(f: (t: C) => D): IList<D> {
>map : Symbol(map, Decl(typeInferenceReturnTypeCallback.ts, 4, 33))
>D : Symbol(D, Decl(typeInferenceReturnTypeCallback.ts, 5, 8))
>f : Symbol(f, Decl(typeInferenceReturnTypeCallback.ts, 5, 11))
>t : Symbol(t, Decl(typeInferenceReturnTypeCallback.ts, 5, 15))
>C : Symbol(C, Decl(typeInferenceReturnTypeCallback.ts, 4, 10))
>D : Symbol(D, Decl(typeInferenceReturnTypeCallback.ts, 5, 8))
>IList : Symbol(IList, Decl(typeInferenceReturnTypeCallback.ts, 0, 0))
>D : Symbol(D, Decl(typeInferenceReturnTypeCallback.ts, 5, 8))

        return null;
    }
}

class Cons<T> implements IList<T>{
>Cons : Symbol(Cons, Decl(typeInferenceReturnTypeCallback.ts, 8, 1))
>T : Symbol(T, Decl(typeInferenceReturnTypeCallback.ts, 10, 11))
>IList : Symbol(IList, Decl(typeInferenceReturnTypeCallback.ts, 0, 0))
>T : Symbol(T, Decl(typeInferenceReturnTypeCallback.ts, 10, 11))

    map<U>(f: (t: T) => U): IList<U> {
>map : Symbol(map, Decl(typeInferenceReturnTypeCallback.ts, 10, 34))
>U : Symbol(U, Decl(typeInferenceReturnTypeCallback.ts, 11, 8))
>f : Symbol(f, Decl(typeInferenceReturnTypeCallback.ts, 11, 11))
>t : Symbol(t, Decl(typeInferenceReturnTypeCallback.ts, 11, 15))
>T : Symbol(T, Decl(typeInferenceReturnTypeCallback.ts, 10, 11))
>U : Symbol(U, Decl(typeInferenceReturnTypeCallback.ts, 11, 8))
>IList : Symbol(IList, Decl(typeInferenceReturnTypeCallback.ts, 0, 0))
>U : Symbol(U, Decl(typeInferenceReturnTypeCallback.ts, 11, 8))

        return this.foldRight(new Nil<U>(), (t, acc) => {
>this.foldRight : Symbol(foldRight, Decl(typeInferenceReturnTypeCallback.ts, 15, 5))
>this : Symbol(Cons, Decl(typeInferenceReturnTypeCallback.ts, 8, 1))
>foldRight : Symbol(foldRight, Decl(typeInferenceReturnTypeCallback.ts, 15, 5))
>Nil : Symbol(Nil, Decl(typeInferenceReturnTypeCallback.ts, 2, 1))
>U : Symbol(U, Decl(typeInferenceReturnTypeCallback.ts, 11, 8))
>t : Symbol(t, Decl(typeInferenceReturnTypeCallback.ts, 12, 45))
>acc : Symbol(acc, Decl(typeInferenceReturnTypeCallback.ts, 12, 47))

            return new Cons<U>();
>Cons : Symbol(Cons, Decl(typeInferenceReturnTypeCallback.ts, 8, 1))
>U : Symbol(U, Decl(typeInferenceReturnTypeCallback.ts, 11, 8))

        });
    }

    foldRight<E>(z: E, f: (t: T, acc: E) => E): E {
>foldRight : Symbol(foldRight, Decl(typeInferenceReturnTypeCallback.ts, 15, 5))
>E : Symbol(E, Decl(typeInferenceReturnTypeCallback.ts, 17, 14))
>z : Symbol(z, Decl(typeInferenceReturnTypeCallback.ts, 17, 17))
>E : Symbol(E, Decl(typeInferenceReturnTypeCallback.ts, 17, 14))
>f : Symbol(f, Decl(typeInferenceReturnTypeCallback.ts, 17, 22))
>t : Symbol(t, Decl(typeInferenceReturnTypeCallback.ts, 17, 27))
>T : Symbol(T, Decl(typeInferenceReturnTypeCallback.ts, 10, 11))
>acc : Symbol(acc, Decl(typeInferenceReturnTypeCallback.ts, 17, 32))
>E : Symbol(E, Decl(typeInferenceReturnTypeCallback.ts, 17, 14))
>E : Symbol(E, Decl(typeInferenceReturnTypeCallback.ts, 17, 14))
>E : Symbol(E, Decl(typeInferenceReturnTypeCallback.ts, 17, 14))

        return null;
    }
}