[naga] Subtractions don't work without whitespace.

[alister-chowdhury]

Description

It seems naga is unable to handle subtracting a number without there being a whitespae between it, which sounds like the lexer order is a bit iffy.

Repro steps

@fragment 
fn main(@location(0) A: vec4f) -> @location(0) vec4f {
    let a = A-2.;
    return a;
}

naga example.frag.wgsl

By comparison, this is deemed ok:

@fragment 
fn main(@location(0) A: vec4f) -> @location(0) vec4f {
    let a = A - 2.;
    return a;
}

Tint seems to have no issue parsing this.

Platform
On x64 Win10, using the latest naga.
naga version: 0.14.0

[teoxoy]

I think this was fixed by #4870. Could you try that commit or latest trunk?

[alister-chowdhury]

cargo run example.frag.wgsll

Seemed to work!
Many thanks, closing ticket!

(I assume I tested this correctly, cloned the repo at trunk and did cargo run from wgpu/naga-cli

[cwfitzgerald]

Sounds correct to me!