test/tint/identifiers/underscore/double/struct.wgsl

@group(0) @binding(0) var<storage, read_write> s: i32;

struct a {
  b : i32,
};
struct a__ {
  b__ : i32,
};

@compute @workgroup_size(1)
fn f() {
  let c = a__();
  let d = c.b__;

  s = c.b__ + d;
}