Spec says both sides of the comparision need to have the same type.
https://www.w3.org/TR/WGSL/#comparison-expr

The following snippet should therefore not pass validation.

const some_vec = vec3<f32>(1.0, 1.0, 1.0);

@fragment
fn main() -> @location(0) vec4<f32> {
    if (all(1.0 < some_vec)) {
        return vec4(0.0);
    }
    return vec4(1.0);
}

Note that Chrome will already correctly reject this, whereas Naga doesn't