// Taking the address of a promoted anonymous-struct union member yields a
// pointer to that member's slot, so mutating through the pointer is visible
// through the member. The write path (`v.x = 41`) and the read path already
// resolve promoted members; the lvalue-pointer path (`@v.x`) now resolves them
// too, via the shared field-lvalue resolver.
//
// Regression (issue 0094, attempt 2): lowerExprAsPtr's union branch handled
// only DIRECT union field names, so `@v.x` on a promoted member reported
// "field 'x' not found on type 'Vec2'" even though `v.x = 41` worked. The
// over-rejection is gone, and a member that is NOT at offset 0 (`v.y`) resolves
// to its own slot — not a default field 0.

#import "modules/std.sx";

Vec2 :: union {
    data: [2]i64;
    struct { x: i64; y: i64; };
}

bump :: (p: *i64) {
    p.* = p.* + 1;
}

main :: () {
    v : Vec2 = ---;
    v.x = 41;
    v.y = 100;
    bump(@v.x);          // promoted member at offset 0 → 42
    bump(@v.y);          // promoted member at offset 8 → 101 (its own slot)
    print("x={}\n", v.x);
    print("y={}\n", v.y);
}