const A = struct { x : i32, };
export fn f() void {
    var a : A = undefined;
    a.foo = 1;
    const y = a.bar;
    _ = y;
}
export fn g() void {
    var a : A = undefined;
    const y = a.bar;
    _ = y;
}

// error
// backend=stage2
// target=native
//
// :4:7: error: no field named 'foo' in struct 'tmp.A'
// :1:11: note: struct declared here
// :10:17: error: no field named 'bar' in struct 'tmp.A'