Internal Compile Error on array without colon

[bftjoe]

fn main() {
let xs[i32; 1] = [1];
}

2:9: 2:11 error: internal compiler error: ident only path should have been covered already
2 let xs[i32; 1] = [1];
^~
note: the compiler unexpectedly panicked. this is a bug.

[rprichard]

This looks like a duplicate of #22972 (and #23597).