// A []T (slice-typed) VALUE stored through a
// WHOLE-deref lhs `*p = sliceval` must move the full 24B {ptr,len,cap} header
// (ref/hare/rt/ensure.ha:4-8), not just {ptr}, migrated from
// test/wcc/944_deref_slice_store_run.c (project #79). The `*p = v` deref-store
// arm was kind-gated on str ONLY; a slice fell to the 1-word default and
// silently DROPPED len+cap. str IS []u8 since Phase 2 (#1), so the str 3-word
// stash+store machinery applies to slices verbatim; the fix widens the gate
// from `str` to `str || slice`. SYMMETRIC across both stages (cs==ww,
// byte-id-BLIND), so only a store->read ROUNDTRIP catches it.
//
// cap != len in every row so a dropped len OR cap is caught.

package deref_slice_store_test;

type box = struct { s: []u8 };

@test fn d_slice_direct() void = {
	// A — `*pp = p`, read back via the DIRECT local `dst`. dst is POISONED
	// first with a different slice q (len=4,cap=5) via a PROVEN 3-word store
	// (`dst = q`, NOT the site under test); a 1-word `*pp=p` leaves q's cap=5,
	// the fix lands 8.
	let hb: [8]u8; hb[0] = 104u8;
	let p: []u8; p.ptr = &hb[0]; p.len = 2; p.cap = 8;
	let qb: [8]u8;
	let q: []u8; q.ptr = &qb[0]; q.len = 4; q.cap = 5;
	let dst: []u8 = q;
	let pp: *[]u8 = &dst;
	*pp = p;
	assert(dst.cap: i32 == 8);
	assert(dst.len: i32 == 2);
	assert(dst[0] == 104u8);
};

@test fn d_slice_thru() void = {
	// B — same store, read back THROUGH the pointer via the 3-word field-deref
	// read `(*pp).cap`/`.len` (already 3-word), confirming the stored header
	// survives a pointer-side read.
	let hb: [8]u8; hb[0] = 104u8;
	let p: []u8; p.ptr = &hb[0]; p.len = 2; p.cap = 8;
	let qb: [8]u8;
	let q: []u8; q.ptr = &qb[0]; q.len = 4; q.cap = 5;
	let dst: []u8 = q;
	let pp: *[]u8 = &dst;
	*pp = p;
	assert((*pp).cap: i32 == 8);
	assert((*pp).len: i32 == 2);
};

@test fn d_str_control() void = {
	// C — control str-deref: the str arm the fix widens around must still land
	// len=5 (regression guard). Poison d="xy" then `*pp="hello"`.
	let d: str = "xy";
	let pp: *str = &d;
	*pp = "hello";
	assert(d.len: i32 == 5);
};

@test fn d_field_control() void = {
	// D — control (*p).field: explicit-deref field store, a separate
	// already-3-word branch. `(*pb).s = p` into a struct{s:[]u8}.
	let hb: [8]u8; hb[0] = 104u8;
	let p: []u8; p.ptr = &hb[0]; p.len = 2; p.cap = 8;
	let b: box;
	let pb: *box = &b;
	(*pb).s = p;
	assert(b.s.cap: i32 == 8);
	assert(b.s.len: i32 == 2);
	assert(b.s[0] == 104u8);
};