test/tint/statements/compound_assign/private.wgsl

var<private> a : i32;
var<private> b : vec4<f32>;
var<private> c : mat2x2<f32>;

@compute @workgroup_size(1)
fn foo() {
  a /= 2;
  b *= mat4x4<f32>();
  c *= 2.0;
}