// Project #242: a mixed-scalar tuple wrapped in a tagged
// union must construct, match-bind, and destructure identically in both stages
// and round-trip every element. Migrated from test/wcc/940_tuple_in_union_run.c
// (K_RUN value rows). Three silent gate-blind cs!=ww divergences were met:
// cstage construction zeroed the whole value instead of packing the tuple
// variant; wwstage's checker left un-annotated destructure binders untyped for
// a non-call rhs; both stages destructured a tuple ident off a stale register
// cursor. The @test fns pin the runtime element values at variant 0 and at a
// non-zero variant index; T2 byte-id keeps cs==ww (rule 10). The K_BUILDERR
// bare-literal-element loud-stop row lives at test/wcc/data/tupunion_bool_literal/.

package tuple_in_union_test;

fn mku_bool_u64(x: u64, s: bool) ((bool, u64) | void) = { return (s, x); };

fn mku_void_arm(ok: bool, x: u64, s: bool) ((bool, u64) | void) = {
	if (ok) { return (s, x); };
	return;
};

fn mku_tuple_tag1(x: u64, s: bool) (void | (bool, u64)) = { return (s, x); };

fn mk_tuple_after_int(which: bool) (int | (bool, u64)) = {
	let s: bool = true;
	let v: u64 = 88u64;
	if (which) { return (s, v); };
	return 5;
};

fn f_eightbyte_share(a: i32, b: i32, c: u64) ((i32, i32, u64) | void) = {
	return (a, b, c);
};

@test fn bool_u64() void = {
	match (mku_bool_u64(7u64, true)) {
	case let t: (bool, u64) => {
		let (sg, u) = t;
		assert(!(u != 7u64));
		assert(!(!sg));
	};
	case void => { assert(false); };
	};
};

@test fn void_arm() void = {
	match (mku_void_arm(false, 1u64, true)) {
	case let t: (bool, u64) => { assert(false); };
	case void => { };
	};
};

@test fn tuple_tag1() void = {
	match (mku_tuple_tag1(9u64, true)) {
	case void => { assert(false); };
	case let t: (bool, u64) => {
		let (sg, u) = t;
		assert(!(u != 9u64));
		assert(!(!sg));
	};
	};
};

@test fn tuple_after_int() void = {
	match (mk_tuple_after_int(true)) {
	case let n: int => { assert(false); };
	case let t: (bool, u64) => {
		let (sg, u) = t;
		assert(!(u != 88u64));
		assert(!(!sg));
	};
	};
};

@test fn eightbyte_share() void = {
	match (f_eightbyte_share(-3, 4, 9u64)) {
	case let t: (i32, i32, u64) => {
		let (x, y, z) = t;
		assert(!(x != -3));
		assert(!(y != 4));
		assert(!(z != 9u64));
	};
	case void => { assert(false); };
	};
};