// A union struct-literal may set only ONE arm — a single direct member, or
// several promoted members of the same anonymous-struct arm. Naming two
// members that overlay the same storage is a compile error (a later store
// would otherwise silently clobber an earlier one). This guards that
// diagnostic. (Companion: examples/types/0194 covers the valid forms.)
#import "modules/std.sx";

Overlay :: union { f: f32; i: i32; }

main :: () {
    o : Overlay = .{ f = 3.14, i = 7 };   // ERROR: f and i overlay the same bytes
    print("{}\n", o.i);
}