If call doesn’t resolve to an overload signature, issue a better error when the implementation would work

[DanielRosenwasser]

interface Foo { hello: string };

function bar1(...foos: Foo[]) {
    bar2(...foos);
}

function bar2(foo1: Foo);
function bar2(foo1: Foo, foo2: Foo);
function bar2(...foos: Foo[]) {
    return;
}

Here we provide an error message like

Expected 1-2 arguments, but got 0 or more.

I just spoke to three engineers who had no indication of what was actually going wrong. We should

• Inform the user that implementation signatures aren't part of the overload set, and that they should consider making the overload an implementation signature
• Provide a quick fix to do so.

[RyanCavanaugh]

I'm worried this will be misleading in a lot of cases

[DanielRosenwasser]

I agree, but we should run it on user tests and the RWC and see what it looks like.