Function overload calling syntax

[SoniEx2]

There should be a way to call function overloads, I propose f::<T>::(argt)(argv). E.g. f::(())(()) would call a function defined as fn f(_x: ()) -> ? when you have multiple f with different args.

[oli-obk]

Rust doesn't have function overloads. So there's no need for a new syntax to call overloaded functions.

[SoniEx2]

struct Type;

impl Type {
  fn a(_x: (), _y: ()) -> () {
  }
}
impl Type {
  fn a(_x: ()) -> () {
  }
}

Come again?

[oli-obk]

That's "just a bug":

impl Type {
  fn a(_x: (), _y: ()) -> () {
  }
  fn a(_x: ()) -> () {
  }
}

errors with

duplicate associated function [E0201]

[SoniEx2]

The thing I did errors when you try to call it, but the error could be solved by adding new function call syntax that puts types into it.

[oli-obk]

The thing I did errors when you try to call it, but the error could be solved by adding new function call syntax that puts types into it.

You could already create a Overload trait and dispatch on that:

struct Type;

trait Overload<T> {
    fn a(T) -> ();
}

impl Overload<((), ())> for Type {
  fn a(args: ((), ())) -> () {
  }
}

impl Overload<((),)> for Type {
  fn a(args: ((),)) -> () {
  }
}

fn main() {
    Type::a(((),));
    Type::a(((),()));
}

[nrc]

Filed rust-lang/rust#35763 for the overloaded function bug.

[Centril]

I'm skeptical that we'll ever do overloading of this sort; so therefore I'll close this to reduce clutter.