Local module variadic function lib signatures only have the final signature used

[justinwoo]

I haven't found a way to have overriding definitions in the source (I don't believe you're supposed to be able to?) and I tried testing a variadic function as a local untyped module and providing lib typings for it. The result was that only the final signature for the function would end up being used instead of being matched to the correct arity (whereas for external modules, the correct signature does seem to be selected, but only if the definitions are in reverse order, see #2360).

Case 1:

Case 2:

Repo with code, details: https://github.com/justinwoo/local-variadic-function-ts-flow

[justinwoo]

Oh, I see now that you are supposed to be able to do inline declarations. This then just has the same behavior as my other issue.

For reference:

declare function assign2<A: Object, B: Object, C: Object, D: Object, E: Object, F: Object>(a: A, b: B, c: C, d: D, e: E, f: F): A & B & C & D & E & F;
declare function assign2<A: Object, B: Object, C: Object, D: Object, E: Object>(a: A, b: B, c: C, d: D, e: E): A & B & C & D & E;
declare function assign2<A: Object, B: Object, C: Object, D: Object>(a: A, b: B, c: C, d: D): A & B & C & D;
declare function assign2<A: Object, B: Object, C: Object>(a: A, b: B, c: C): A & B & C;
declare function assign2<A: Object, B: Object>(a: A, b: B): A & B;
declare function assign2<A: Object>(a: A): A;
function assign2(...objects) {
  var init = objects[0];
  for (var i = 1; i < objects.length; i++) {
    var obj = objects[i];
    for (var k in obj) {
      if (obj.hasOwnProperty(k)) {
        init[k] = obj[k];
      }
    }
  }
  return init;
}