Syntax highlighting fail when using bit ops inside type parameters

[alexr00]

From @ylxdzsw in microsoft/vscode#77380:

(originally reported here)

Currently the grammar does not recognize bit shifting punctuations inside type parameters. Example:

fn main() {
    let a = unsafe { std::mem::uninitialized::<[u8; 1<<14]>() };
    println!("{:?}", a[0])
}

This file is valid and can be compiled and run by rustc. However, vscode does not correctly render the color after <[u8; 1<<14]>. This is what it currently shows:

The highlighting works if I remove the bit shift operation:

[mayerraphael]

I have a similiar problem. The highlighting fails at the second chevron: