=== tests/cases/compiler/overloadOnGenericArity.ts ===
interface Test {
>Test : Test, Symbol(Test, Decl(overloadOnGenericArity.ts, 0, 0))

    then<U>(p: string): string;
>then : { <U>(p: string): string; (p: string): Date; }, Symbol(then, Decl(overloadOnGenericArity.ts, 0, 16), Decl(overloadOnGenericArity.ts, 1, 31))
>U : U, Symbol(U, Decl(overloadOnGenericArity.ts, 1, 9))
>p : string, Symbol(p, Decl(overloadOnGenericArity.ts, 1, 12))

    then(p: string): Date; // Error: Overloads cannot differ only by return type
>then : { <U>(p: string): string; (p: string): Date; }, Symbol(then, Decl(overloadOnGenericArity.ts, 0, 16), Decl(overloadOnGenericArity.ts, 1, 31))
>p : string, Symbol(p, Decl(overloadOnGenericArity.ts, 2, 9))
>Date : Date, Symbol(Date, Decl(lib.d.ts, 633, 23), Decl(lib.d.ts, 815, 11))
}