ICE when using struct constructor with explicit const generic arguments

[jplatte]

This very simple example (Playground link):

#![feature(const_generics)]

struct Generic<const V: usize>;

fn main() {
    let _ = Generic::<0>;
}

results in: error: internal compiler error: src/librustc_typeck/collect.rs:1407: unexpected const parent path def Def(Ctor(Struct, Const), DefId(0:13 ~ playground[d52b]::Generic[0]::{{constructor}}[0])). Changing it to use curly braces around 0 does not help.

[DutchGhost]

This does work:

#![feature(const_generics)]

struct Generic<const V: usize>;

fn main() {
    let _ = Generic::<{0}>{};
}

[davidtwco]

@varkor I was actually just experimenting locally to see if I could fix this and I think I have, I could put a PR up in a few minutes.