=== tests/cases/compiler/parseErrorIncorrectReturnToken.ts ===
type F1 = {
>F1 : Symbol(F1, Decl(parseErrorIncorrectReturnToken.ts, 0, 0))

    (n: number) => string; // should be : not =>
>n : Symbol(n, Decl(parseErrorIncorrectReturnToken.ts, 1, 5))
}
type F2 = (n: number): string; // should be => not :
>F2 : Symbol(F2, Decl(parseErrorIncorrectReturnToken.ts, 2, 1))
>n : Symbol(n, Decl(parseErrorIncorrectReturnToken.ts, 3, 11))
> : Symbol(unknown)

// doesn't work in non-type contexts, where the return type is optional
let f = (n: number) => string => n.toString();
>f : Symbol(f, Decl(parseErrorIncorrectReturnToken.ts, 6, 3))
>n : Symbol(n, Decl(parseErrorIncorrectReturnToken.ts, 6, 9))
>string : Symbol(string, Decl(parseErrorIncorrectReturnToken.ts, 6, 22))
>n.toString : Symbol(Number.toString, Decl(lib.es5.d.ts, --, --))
>n : Symbol(n, Decl(parseErrorIncorrectReturnToken.ts, 6, 9))
>toString : Symbol(Number.toString, Decl(lib.es5.d.ts, --, --))

let o = {
>o : Symbol(o, Decl(parseErrorIncorrectReturnToken.ts, 7, 3))

    m(n: number) => string {
>m : Symbol(m, Decl(parseErrorIncorrectReturnToken.ts, 7, 9))
>n : Symbol(n, Decl(parseErrorIncorrectReturnToken.ts, 8, 6))

        return n.toString();
    }
};