ww/test/wcc/941_tuple_slot_layout_run.c

/*
 * 941_tuple_slot_layout_run — tuple arc C-t0: SLOT layout is the tuple
 * SSoT (user-ratified). The checker's TY_TUPLE size counts the stride
 * cgen's cursor transport actually writes — a str/slice its 24B header,
 * everything else (narrow scalars included) one 8B eightbyte — and the
 * t.N read walks stride the same slots.
 *
 * Pre-C-t0 there were TWO answers: the checker summed PACKED element
 * sizes ((u32,u32) = 8B) while every cursor transport site strode 8B
 * slots (16B). The 16B shapes were blind to the split (slot == packed);
 * the packed shapes hit it everywhere:
 *   - `let t: (u32,u32) = f()` — cstage's receive keys on the checker
 *     size (16/32), so sz=8 fell to the generic single-word store
 *     (word 1 DROPPED) and the packed read walk then read the wrong
 *     offsets. wwstage (slot-keyed throughout) was runtime-CORRECT
 *     here — inverted polarity vs the 16B #33 map, gate-blind.
 *   - a (u32,u32) by-value param: cgfn's receive walk spilled
 *     8B/element into a local sized from the PACKED checker size (8B)
 *     — word 1 landed on the saved-BP slot, frame corruption, SIGSEGV.
 *   - a mixed (u32,f64)/(u32,str) tuple: packed sz (12/28) missed the
 *     16/32 receive arms entirely — silent drop on both stages.
 *
 * The send-side ABI skew (#32, C-t2) and the wwstage literal-let
 * receive (#33, C-t1) are SEPARATE bugs pinned by their own commits;
 * this test pins the layout unification only:
 *
 *   row                  | shape                                | want
 *   ---------------------+--------------------------------------+-----
 *   letcall_packed       | let t:(u32,u32)=f(); t.0/t.1         | 0
 *   letcall_float_packed | (u32,f64) from call, X0 element      | 0
 *   letcall_signed_packed| (i32,i32) negatives — MOVSXD reads   | 0
 *   letcall_mixed_packed | (u32,str): 28B packed missed the 32B |
 *                        | arm; len(t.1) strides a full slot    | 0
 *   len_elem_packed      | len(t.1) of (u32,str) — #235 arm's   |
 *                        | slot stride (was BP+4+8)             | (in mixed row)
 *   letcall_16_neutral   | (i64,i64) — slot==packed, anchor     | 0
 *   letcall_32_neutral   | (i64,str) — 32B arm, anchor          | 0
 *   mlet_packed_neutral  | let (a,b) = f() packed — per-element |
 *                        | locals, layout-independent anchor    | 0
 *
 * Every row also asserts cstage/wwstage asm byte-id.
 * NNN<950, self-contained (/tmp, no imports) — rule-14's
 * selfhost-sibling race does not apply (903/940/945 precedent).
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/wait.h>

static int
runwait(const char *cmd)
{
	int rc = system(cmd);
	if (rc == -1) return -1;
	if (WIFEXITED(rc)) return WEXITSTATUS(rc);
	return -1;
}

static int
slurp_eq(const char *a, const char *b)
{
	FILE *fa = fopen(a, "rb");
	FILE *fb = fopen(b, "rb");
	if (!fa || !fb) { if (fa) fclose(fa); if (fb) fclose(fb); return -1; }
	int rc = 0;
	for (;;) {
		int ca = fgetc(fa), cb = fgetc(fb);
		if (ca != cb) { rc = -1; break; }
		if (ca == EOF) break;
	}
	fclose(fa); fclose(fb);
	return rc;
}

#define K_RUN      0	/* build+run both drivers, exit==want, + cs==ww byte-id */
#define K_BUILDERR 1	/* build must FAIL with experr on BOTH drivers (rule 7) */

struct row { const char *label; const char *src; int want;
             int kind; const char *experr; };

/* errlog_has — a BUILDERR row must fail WITH its diagnostic; any other
 * failure (parse error, crash) is a vacuous reject (940 precedent). */
static int
errlog_has(const char *path, const char *needle)
{
	FILE *f = fopen(path, "rb");
	if (!f) return 0;
	char buf[8192];
	size_t got = fread(buf, 1, sizeof buf - 1, f);
	fclose(f);
	buf[got] = '\0';
	return strstr(buf, needle) != NULL;
}

static const struct row rows[] = {
	{ "letcall_packed",
	  "package main;\n"
	  "fn f() (u32, u32) = {\n"
	  "	return (3, 4);\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t: (u32, u32) = f();\n"
	  "	if (t.0 != 3) { return 1; };\n"
	  "	if (t.1 != 4) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	{ "letcall_float_packed",
	  "package main;\n"
	  "fn f() (u32, f64) = {\n"
	  "	let a: u32 = 9;\n"
	  "	let x: f64 = 2.5;\n"
	  "	return (a, x);\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t: (u32, f64) = f();\n"
	  "	if (t.0 != 9) { return 1; };\n"
	  "	if (t.1 != 2.5) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	{ "letcall_signed_packed",
	  "package main;\n"
	  "fn f() (i32, i32) = {\n"
	  "	let a: i32 = -5;\n"
	  "	let b: i32 = -6;\n"
	  "	return (a, b);\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t: (i32, i32) = f();\n"
	  "	if (t.0 != -5) { return 1; };\n"
	  "	if (t.1 != -6) { return 2; };\n"
	  "	if (t.0 + t.1 != -11) { return 3; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	{ "letcall_mixed_packed",
	  "package main;\n"
	  "fn f() (u32, str) = {\n"
	  "	let a: u32 = 7;\n"
	  "	let s: str = \"hello\";\n"
	  "	return (a, s);\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t: (u32, str) = f();\n"
	  "	if (t.0 != 7) { return 1; };\n"
	  "	if (len(t.1) != 5) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	{ "letcall_16_neutral",
	  "package main;\n"
	  "fn f() (i64, i64) = {\n"
	  "	return (41, 17);\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t: (i64, i64) = f();\n"
	  "	if (t.0 != 41) { return 1; };\n"
	  "	if (t.1 != 17) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	{ "letcall_32_neutral",
	  "package main;\n"
	  "fn f() (i64, str) = {\n"
	  "	let a: i64 = 12;\n"
	  "	let s: str = \"wxyz\";\n"
	  "	return (a, s);\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t: (i64, str) = f();\n"
	  "	if (t.0 != 12) { return 1; };\n"
	  "	if (len(t.1) != 4) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	{ "mlet_packed_neutral",
	  "package main;\n"
	  "fn f() (u32, u32) = {\n"
	  "	return (3, 4);\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let (a, b) = f();\n"
	  "	if (a != 3) { return 1; };\n"
	  "	if (b != 4) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },

	/* ---- #22 commit 0: the wwstage size()/align() fold (astsize)
	 * summed PACKED element sizes for N_TTUPLE — a C-t0 escape. The
	 * type table (tupleelemslot) and cstage both said slot-sum;
	 * size((u32,u32)) folded to 16 on cstage and 8 on wwstage —
	 * silent cs≠ww in any folded constant. astsize now reads the
	 * tuple tinfo, so the slot SSoT has ONE wwstage answer. The
	 * recursive escapes (tuple inside struct/array sizing) ride the
	 * same arm. ---- */
	{ "c0_sizefold_slot",
	  "package main;\n"
	  "export fn main() i32 = {\n"
	  "	if (size((u32, u32)) != 16) { return 1; };\n"
	  "	if (size((size, size)) != 16) { return 2; };\n"
	  "	if (size((u32, str)) != 32) { return 3; };\n"
	  "	if (size((str, str)) != 48) { return 4; };\n"
	  "	if (align((u32, u32)) != 4) { return 5; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	{ "c0_sizefold_recursive",
	  "package main;\n"
	  "type holder = struct { t: (u32, u32), x: i64 };\n"
	  "export fn main() i32 = {\n"
	  "	if (size(holder) != 24) { return 1; };\n"
	  "	if (size([4](u32, u32)) != 64) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },

	/* ---- #22a: TAGGED elements in tuples. slot = roundup8(size(elem))
	 * — 8B is a FLOOR, not a ceiling (user-ratified 2026-06-04).
	 * Pre-#22a the checker truncated a tagged element to one 8B slot
	 * (cstage SIZE 16 vs wwstage astsize 24, cs≠ww) and every cgen
	 * transport walk strode wide=(STR||SLICE)-else-8 — cstage read the
	 * NEIGHBOR slot, wwstage read ZEROS (both-wrong-differently,
	 * byte-cmp-blind). tuple_eslot/tupeslot is now the one stride
	 * accessor. In-cap shapes work end-to-end; over-cap (>4 GP
	 * eightbytes — the fold-5b 3-elem shape) stays LOUD until #22b.
	 * Tagged inits use the CAST form (`5: size`): the bare untyped-int
	 * widen-store mis-tag is a separate pre-existing bug (task #33). */
	{ "t22_sizefold_tagged",
	  "package main;\n"
	  "export fn main() i32 = {\n"
	  "	if (size(((void | size), size)) != 24) { return 1; };\n"
	  "	if (size((size, (void | size))) != 24) { return 2; };\n"
	  "	if (size(((void | size), (void | size), size)) != 40) { return 3; };\n"
	  "	if (align(((void | size), size)) != 8) { return 4; };\n"
	  "	if (size((u64, void)) != 8) { return 5; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	{ "t22_roundtrip",
	  "package main;\n"
	  "fn mk() ((void | size), size) = {\n"
	  "	let mn: (void | size) = 5: size;\n"
	  "	return (mn, 4);\n"
	  "};\n"
	  "fn mk2() (size, (void | size)) = {\n"
	  "	let mx: (void | size) = 7: size;\n"
	  "	return (9, mx);\n"
	  "};\n"
	  "fn mkv() ((void | size), size) = {\n"
	  "	let mn: (void | size) = void;\n"
	  "	return (mn, 3);\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t = mk();\n"
	  "	if (!(t.0 is size)) { return 1; };\n"
	  "	if (t.0 as size != 5) { return 2; };\n"
	  "	if (t.1 != 4) { return 3; };\n"
	  "	let u = mk2();\n"
	  "	if (u.0 != 9) { return 4; };\n"
	  "	if (!(u.1 is size)) { return 5; };\n"
	  "	if (u.1 as size != 7) { return 6; };\n"
	  "	let v = mkv();\n"
	  "	if (!(v.0 is void)) { return 7; };\n"
	  "	if (v.1 != 3) { return 8; };\n"
	  "	let (a, b) = mk();\n"
	  "	if (!(a is size)) { return 9; };\n"
	  "	if (a as size != 5) { return 10; };\n"
	  "	if (b != 4) { return 11; };\n"
	  "	let mn: (void | size) = 6: size;\n"
	  "	let w: ((void | size), size) = (mn, 2);\n"
	  "	if (!(w.0 is size)) { return 12; };\n"
	  "	if (w.0 as size != 6) { return 13; };\n"
	  "	if (w.1 != 2) { return 14; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	/* mixed SSE/GP with a tagged box: the f64 rides X0 on the SSE
	 * counter while the tagged element takes 2 consecutive GP
	 * eightbytes (GP total 3, in-cap) — pins the independent-counter
	 * interplay the scalar-only rows can't. */
	{ "t22_float_mix",
	  "package main;\n"
	  "fn mk() (f64, (void | size), i64) = {\n"
	  "	let mn: (void | size) = 6: size;\n"
	  "	return (2.5, mn, 9);\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t = mk();\n"
	  "	if (t.0 != 2.5) { return 1; };\n"
	  "	if (!(t.1 is size)) { return 2; };\n"
	  "	if (t.1 as size != 6) { return 3; };\n"
	  "	if (t.2 != 9) { return 4; };\n"
	  "	let (x, y, z) = mk();\n"
	  "	if (x != 2.5) { return 5; };\n"
	  "	if (!(y is size)) { return 6; };\n"
	  "	if (y as size != 6) { return 7; };\n"
	  "	if (z != 9) { return 8; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	/* TWO tagged elements in-cap (2+2 GP eightbytes == TUPLE_GPCAP):
	 * narrow u32 payload, negative i64 payload, void variant —
	 * regression-pins ken's k1 probe (probes evaporate, rows don't). */
	{ "t22_two_tagged",
	  "package main;\n"
	  "fn mk() ((void | u32), (void | i64)) = {\n"
	  "	let a: (void | u32) = 9: u32;\n"
	  "	let b: (void | i64) = -5: i64;\n"
	  "	return (a, b);\n"
	  "};\n"
	  "fn mkv() ((void | u32), (void | i64)) = {\n"
	  "	let a: (void | u32) = void;\n"
	  "	let b: (void | i64) = -41: i64;\n"
	  "	return (a, b);\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t = mk();\n"
	  "	if (!(t.0 is u32)) { return 1; };\n"
	  "	if (t.0 as u32 != 9) { return 2; };\n"
	  "	if (!(t.1 is i64)) { return 3; };\n"
	  "	if (t.1 as i64 != -5) { return 4; };\n"
	  "	let v = mkv();\n"
	  "	if (!(v.0 is void)) { return 5; };\n"
	  "	if (v.1 as i64 != -41) { return 6; };\n"
	  "	let (a, b) = mk();\n"
	  "	if (a as u32 != 9) { return 7; };\n"
	  "	if (b as i64 != -5) { return 8; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	/* tagged FIRST, float second — the SSE/GP counter interplay in the
	 * other element order (t22_float_mix covers float-first; ken k2
	 * proved both orders, this pins the reverse). */
	{ "t22_float_mix_rev",
	  "package main;\n"
	  "fn mk() ((void | size), f64) = {\n"
	  "	let mn: (void | size) = 6: size;\n"
	  "	return (mn, 0.25);\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t = mk();\n"
	  "	if (!(t.0 is size)) { return 1; };\n"
	  "	if (t.0 as size != 6) { return 2; };\n"
	  "	if (t.1 != 0.25) { return 3; };\n"
	  "	let (y, z) = mk();\n"
	  "	if (y as size != 6) { return 4; };\n"
	  "	if (z != 0.25) { return 5; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	/* tagged tuple element as a CALL ARG — the call-boundary SEND of
	 * the ruled condition-(c) matrix. cstage rides its generic
	 * node_istaggedarg cursor push; wwstage's kind-gated aistagged
	 * missed N_DOT and mis-routed t.0 into the widening branch
	 * (clamped tag 0 — callee read `void`, silent). reviewer-22 fix:
	 * cgenutil.ww N_DOT arm (aistagged + pushargsrev). */
	{ "t22_elem_arg",
	  "package main;\n"
	  "fn takes(v: (void | size)) size = {\n"
	  "	if (v is size) { return v as size; };\n"
	  "	return 0;\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let mn: (void | size) = 5: size;\n"
	  "	let t: ((void | size), size) = (mn, 4);\n"
	  "	if (takes(t.0) != 5) { return 1; };\n"
	  "	if (takes(t.0) + t.1 != 9) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },

	/* rule-7 louds: every tagged-tuple route that is not
	 * correct-via-accessor must die LOUD (the #22a exit invariant). */
	{ "t22_reject_arg",
	  "package main;\n"
	  "fn send(t: ((void | size), size)) size = { return t.1; };\n"
	  "export fn main() i32 = {\n"
	  "	let mn: (void | size) = 5: size;\n"
	  "	let t: ((void | size), size) = (mn, 4);\n"
	  "	return send(t): i32;\n"
	  "};\n", 0,
	  K_BUILDERR, "tuple arg element kind unsupported" },
	{ "t22_reject_overcap_return",
	  "package main;\n"
	  "fn pr() ((void | size), (void | size), size) = {\n"
	  "	let a: (void | size) = 1: size;\n"
	  "	let b: (void | size) = 2: size;\n"
	  "	return (a, b, 7);\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t = pr();\n"
	  "	return t.2: i32;\n"
	  "};\n", 0,
	  K_BUILDERR, "#22b: tagged element in an over-cap (sret) tuple "
	  "return unwired" },
	/* ken R1: an OVER-CAP tuple literal init (a tagged box >16B pushes
	 * the shape past TUPLE_GPCAP) fell past every cstage N_LET store
	 * arm to NOTHING — silent uninitialized-frame reads — while
	 * wwstage loud-rejected. Pre-existing for (str,str) literals; the
	 * #22a tagged slots routed tagged shapes into it. Both pins. */
	{ "t22_reject_overcap_lit_tagged",
	  "package main;\n"
	  "export fn main() i32 = {\n"
	  "	let e: (void | u32 | str) = \"abc\";\n"
	  "	let t: (u64, (void | u32 | str)) = (7u64, e);\n"
	  "	if (t.0 != 7u64) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0,
	  K_BUILDERR, "tuple literal exceeds register-return ABI capacity" },
	{ "t22_reject_overcap_lit_strs",
	  "package main;\n"
	  "export fn main() i32 = {\n"
	  "	let t: (str, str) = (\"ab\", \"cde\");\n"
	  "	if (t.0.len != 2) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0,
	  K_BUILDERR, "tuple literal exceeds register-return ABI capacity" },
	{ "t22_reject_lit_call_elem",
	  "package main;\n"
	  "fn g() (void | size) = { return 5: size; };\n"
	  "fn mk() ((void | size), size) = { return (g(), 4); };\n"
	  "export fn main() i32 = {\n"
	  "	let t = mk();\n"
	  "	return t.1: i32;\n"
	  "};\n", 0,
	  K_BUILDERR, "tagged tuple element from a non-local source shape "
	  "unwired" },
	{ "t22_reject_global_init",
	  "package main;\n"
	  "let g: ((void | size), i64) = (5, 4);\n"
	  "export fn main() i32 = { return g.1: i32; };\n", 0,
	  K_BUILDERR, "unsupported element init (int/str literals only; "
	  "rule 7)" },
	/* pre-existing loud (no-regress pin): tuple element WRITE. */
	{ "t22_reject_elem_write",
	  "package main;\n"
	  "export fn main() i32 = {\n"
	  "	let mn: (void | size) = 5: size;\n"
	  "	let t: ((void | size), size) = (mn, 4);\n"
	  "	t.1 = 9;\n"
	  "	return t.1: i32;\n"
	  "};\n", 0,
	  K_BUILDERR, "unsupported assign target shape" },

	/* ---- over-cap (sret) NARROW-scalar stride: the sret buffer is
	 * slot-laid (C-t0) on EVERY side — send, let-receive, MLET, and
	 * MASSIGN copy-out. Pre-review the wwstage SEND and MASSIGN
	 * receive strode packed esz (4 for u32): self-consistent at base
	 * (ran right, byte-diff), but #22a's MLET-receive slot flip alone
	 * made ww read c at 32 while its send wrote 28 — a ww runtime
	 * REGRESSION the suite had no row for (reviewer-22). (str,u32,str)
	 * = 7 GP words, over-cap. ---- */
	{ "sret_narrow_mix_let",
	  "package main;\n"
	  "fn f() (str, u32, str) = {\n"
	  "	let a: str = \"abc\";\n"
	  "	let b: u32 = 7;\n"
	  "	let c: str = \"wxyz\";\n"
	  "	return (a, b, c);\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t = f();\n"
	  "	if (len(t.0) != 3) { return 1; };\n"
	  "	if (t.1 != 7) { return 2; };\n"
	  "	if (len(t.2) != 4) { return 3; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	{ "sret_narrow_mix_mlet",
	  "package main;\n"
	  "fn f() (str, u32, str) = {\n"
	  "	let a: str = \"abc\";\n"
	  "	let b: u32 = 7;\n"
	  "	let c: str = \"wxyz\";\n"
	  "	return (a, b, c);\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let (a, b, c) = f();\n"
	  "	if (len(a) != 3) { return 1; };\n"
	  "	if (b != 7) { return 2; };\n"
	  "	if (len(c) != 4) { return 3; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	{ "sret_narrow_mix_massign",
	  "package main;\n"
	  "fn f() (str, u32, str) = {\n"
	  "	let a: str = \"abc\";\n"
	  "	let b: u32 = 7;\n"
	  "	let c: str = \"wxyz\";\n"
	  "	return (a, b, c);\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let a: str = \"\";\n"
	  "	let b: u32 = 0;\n"
	  "	let c: str = \"\";\n"
	  "	a, b, c = f();\n"
	  "	if (len(a) != 3) { return 1; };\n"
	  "	if (b != 7) { return 2; };\n"
	  "	if (len(c) != 4) { return 3; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },

	/* ---- C-t1 (#33): the let RECEIVE re-keyed onto the declared
	 * type's register classify. Pre-C-t1 wwstage keyed on producer
	 * SHAPE (mixed-str syntactic / rettupleof N_CALL) so a
	 * scalar-scalar LITERAL matched neither and dropped word 1;
	 * cstage keyed on sz==16/32 so 24B 3-scalar shapes dropped words
	 * on BOTH sources. ---- */
	{ "t1_lit_packed",
	  "package main;\n"
	  "fn second() u32 = {\n"
	  "	let t: (u32, u32) = (3, 4);\n"
	  "	if (t.0 != 3) { return 99; };\n"
	  "	return t.1;\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	if (second() != 4) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	{ "t1_lit_16",
	  "package main;\n"
	  "export fn main() i32 = {\n"
	  "	let t: (i64, i64) = (3, 4);\n"
	  "	if (t.0 != 3) { return 1; };\n"
	  "	if (t.1 != 4) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	{ "t1_lit_mixed",
	  "package main;\n"
	  "export fn main() i32 = {\n"
	  "	let t: (i64, str) = (12, \"wxyz\");\n"
	  "	if (t.0 != 12) { return 1; };\n"
	  "	if (len(t.1) != 4) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	{ "t1_lit_3scalar",
	  "package main;\n"
	  "fn second() i64 = {\n"
	  "	let t: (i64, i64, i64) = (3, 4, 5);\n"
	  "	if (t.0 != 3) { return -1; };\n"
	  "	if (t.1 != 4) { return -2; };\n"
	  "	return t.2;\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	if (second() != 5) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	{ "t1_call_3scalar",
	  "package main;\n"
	  "fn f() (i64, i64, i64) = {\n"
	  "	return (7, 8, 9);\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t: (i64, i64, i64) = f();\n"
	  "	if (t.0 != 7) { return 1; };\n"
	  "	if (t.1 != 8) { return 2; };\n"
	  "	if (t.2 != 9) { return 3; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	{ "t1_call_noannot_neutral",
	  "package main;\n"
	  "fn f() (i64, i64) = {\n"
	  "	return (3, 4);\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t = f();\n"
	  "	if (t.0 != 3) { return 1; };\n"
	  "	if (t.1 != 4) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },

	/* ---- C-t2 (#32): the by-value tuple ARG send. node_tuplearg
	 * was N_CALL-scoped (and its comment FALSELY claimed the rest
	 * loud-stop): a tuple ident/literal/unwrap arg fell to the
	 * scalar single-PUSHQ default, skewing every later arg register
	 * — the callee read garbage word 2 (packed shapes SIGSEGV'd
	 * pre-C-t0). Now every cursor-filling producer rides the #163
	 * @tupargscr restage; any other tuple-typed source loud-stops. ---- */
	{ "t2_param_packed",
	  "package main;\n"
	  "fn pick(t: (u32, u32), k: i32) u32 = {\n"
	  "	if (k == 0) { return t.0; };\n"
	  "	return t.1;\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t: (u32, u32) = (41, 17);\n"
	  "	if (pick(t, 0) != 41) { return 1; };\n"
	  "	if (pick(t, 1) != 17) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	{ "t2_param_16",
	  "package main;\n"
	  "fn pick(t: (i64, i64), k: i32) i64 = {\n"
	  "	if (k == 0) { return t.0; };\n"
	  "	return t.1;\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t: (i64, i64) = (41, 17);\n"
	  "	if (pick(t, 0) != 41) { return 1; };\n"
	  "	if (pick(t, 1) != 17) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	{ "t2_mixed_order",
	  "package main;\n"
	  "fn g(a: i64, t: (u32, u32), b: i64) i64 = {\n"
	  "	return a*1000 + (t.0: i64)*100 + (t.1: i64)*10 + b;\n"
	  "};\n"
	  "fn h(t: (i64, i64), s: str, k: i64) i64 = {\n"
	  "	return t.0 + t.1 + (len(s): i64) + k;\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t: (u32, u32) = (3, 4);\n"
	  "	if (g(1, t, 2) != 1342) { return 1; };\n"
	  "	let u: (i64, i64) = (10, 20);\n"
	  "	if (h(u, \"abc\", 7) != 40) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	{ "t2_lit_arg",
	  "package main;\n"
	  "fn pick(t: (i64, i64), k: i32) i64 = {\n"
	  "	if (k == 0) { return t.0; };\n"
	  "	return t.1;\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	if (pick((41, 17), 0) != 41) { return 1; };\n"
	  "	if (pick((41, 17), 1) != 17) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	{ "t2_float_param",
	  "package main;\n"
	  "fn fsum(t: (f64, i64)) f64 = {\n"
	  "	return t.0 + (t.1: f64);\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t: (f64, i64) = (2.5, 4);\n"
	  "	if (fsum(t) != 6.5) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	{ "t2_unwrap_arg",
	  "package main;\n"
	  "fn mk() ((i64, i64) | nomem) = {\n"
	  "	let a: i64 = 5;\n"
	  "	let b: i64 = 6;\n"
	  "	return (a, b);\n"
	  "};\n"
	  "fn sum(t: (i64, i64)) i64 = {\n"
	  "	return t.0 + t.1;\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	if (sum(mk()!) != 11) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	/* ken's >6-GP-pressure stress: 4 leading scalars + the 2-word
	 * tuple + a 7th GP word — the restage drain fills the INTEGER
	 * cursor past the tuple and the 7th word must still land in the
	 * stack arg class, not be eaten or shifted by the tuple's pops. */
	{ "t2_gp_pressure",
	  "package main;\n"
	  "fn f(a: i64, b: i64, c: i64, d: i64, t: (i64, i64), e: i64) i64 = {\n"
	  "	if (e != 60) { return -1; };\n"
	  "	if (a != 1 || b != 2 || c != 3 || d != 4) { return -2; };\n"
	  "	return t.0 * 100 + t.1;\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t: (i64, i64) = (7, 9);\n"
	  "	if (f(1, 2, 3, 4, t, 60) != 709) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	/* a tuple arg mixed with a VARIADIC tail rides the same restage —
	 * positive pin of the variadic interaction (ken demand 2). */
	{ "t2_variadic_after_tuple",
	  "package main;\n"
	  "fn g(t: (i64, i64), xs: i64...) i64 = {\n"
	  "	let s: i64 = t.0 + t.1;\n"
	  "	for (let x .. xs) { s += x; };\n"
	  "	return s;\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t: (i64, i64) = (3, 4);\n"
	  "	if (g(t, 1, 2) != 10) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	/* rule-7 (ken demand 1): a NESTED composite element (tuple-in-
	 * tuple here) occupies more than the one GP word the restage walk
	 * counts — pre-guard the checker accepted it and it ran WRONG
	 * (inner words skewed; wwstage SIGSEGV'd). Loud until a consumer
	 * motivates the wiring. */
	{ "t2_reject_nested_elem_arg",
	  "package main;\n"
	  "fn f(t: ((i64, i64), i64)) i64 = {\n"
	  "	return t.1;\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let inner: (i64, i64) = (1, 2);\n"
	  "	let t: ((i64, i64), i64) = (inner, 9);\n"
	  "	if (f(t) != 9) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0,
	  K_BUILDERR, "tuple arg element kind unsupported" },
	/* variadic-of-tuples ((i64,i64)...) stays LOUD via the
	 * tuple-in-slice read surface — bounded, not silent (demand 2). */
	{ "t2_reject_variadic_of_tuples",
	  "package main;\n"
	  "fn first(ts: (i64, i64)...) i64 = {\n"
	  "	if (len(ts) == 0) { return -1; };\n"
	  "	return ts[0].0;\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t: (i64, i64) = (3, 4);\n"
	  "	if (first(t) != 3) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0,
	  K_BUILDERR, "unsupported field-read shape" },
	/* rule-7: a tuple arg from a source whose cgexpr does NOT fill
	 * the cursor (here a struct-field chain) dies loud — pre-C-t2
	 * it fell to the scalar single-PUSHQ default silently. */
	{ "t2_reject_chain_arg",
	  "package main;\n"
	  "type holder = struct { t: (i64, i64) };\n"
	  "fn sum(t: (i64, i64)) i64 = {\n"
	  "	return t.0 + t.1;\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let h: holder = holder{ t = (1, 2) };\n"
	  "	if (sum(h.t) != 3) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0,
	  K_BUILDERR, "tuple arg from unsupported source shape" },
	/* rule-7: an over-cap tuple ident arg louds at the slot-to-cursor
	 * cap (the #10 sret follow-up), never a partial push. */
	{ "t2_reject_overcap_ident_arg",
	  "package main;\n"
	  "fn f(t: (str, str)) i64 = {\n"
	  "	return (len(t.0) + len(t.1)): i64;\n"
	  "};\n"
	  "fn g() (str, str) = {\n"
	  "	return (\"ab\", \"cde\");\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let t: (str, str) = g();\n"
	  "	if (f(t) != 5) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0,
	  K_BUILDERR, "tuple ident exceeds register-return ABI capacity" },
	/* fold-4 substrate pin (charset_range_item = [](u32,u32)): the
	 * tuple-in-slice consumer shape is LOUD today, both stages —
	 * wiring it is fold-4's prerequisite work, not a silent gap. */
	{ "charset_slice_append_reject",
	  "package main;\n"
	  "export fn main() i32 = {\n"
	  "	let s: [](u32, u32) = [];\n"
	  "	append(s, (1, 2));\n"
	  "	if (len(s) != 1) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0,
	  K_BUILDERR, "element kind unsupported" },

	/* ---- C-t3 (#48): GLOBAL tuples. Pre-C-t3 the definition was
	 * SILENTLY skipped (let_emit_size 0 → no DATA, no diagnostic);
	 * cstage element reads then read BP-frame garbage (localfind→0)
	 * and wwstage mis-emitted the field index as a symbol
	 * (`MOVQ 0(SB), AX`). Now: slot-laid DATAW (+ DATAR str-element
	 * ptr patches), element reads + len(g.N) via LEAQ sym(SB);
	 * unsupported element inits and the whole-tuple-as-value shape
	 * die LOUD. ---- */
	{ "t3_global_elem",
	  "package main;\n"
	  "let g: (str, i64) = (\"hello\", 9);\n"
	  "let h: (u32, u32) = (5, 6);\n"
	  "export fn main() i32 = {\n"
	  "	if (len(g.0) != 5) { return 1; };\n"
	  "	if (g.1 != 9) { return 2; };\n"
	  "	if (h.0 != 5) { return 3; };\n"
	  "	if (h.1 != 6) { return 4; };\n"
	  "	return 0;\n"
	  "};\n", 0, K_RUN, NULL },
	{ "t3_reject_float_global",
	  "package main;\n"
	  "let g: (f64, i64) = (2.5, 4);\n"
	  "export fn main() i32 = {\n"
	  "	if (g.1 != 4) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0,
	  K_BUILDERR, "unsupported element init (int/str literals only; rule 7)" },
	{ "t3_reject_whole_value",
	  "package main;\n"
	  "let g: (i64, i64) = (3, 4);\n"
	  "export fn main() i32 = {\n"
	  "	let q: (i64, i64) = g;\n"
	  "	if (q.0 != 3) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0,
	  K_BUILDERR, "global tuple as a first-class value unwired" },
	/* pre-existing loud (no-regress pin): global tuple element WRITE. */
	{ "t3_reject_global_write",
	  "package main;\n"
	  "let g: (i64, i64) = (3, 4);\n"
	  "export fn main() i32 = {\n"
	  "	g.0 = 7;\n"
	  "	return 0;\n"
	  "};\n", 0,
	  K_BUILDERR, "unsupported assign target shape" },
};

/* build+run via a driver (ww / ww_ww); returns 0 pass, nonzero fail. */
static int
run_driver(const char *driver, const struct row *r, int i)
{
	char src[96], tmpdir[96], errf[96], cmd[1024];
	snprintf(src, sizeof src, "/tmp/tsl_%d_%d.ww", getpid(), i);
	snprintf(tmpdir, sizeof tmpdir, "/tmp/tsl_%d_d_%d", getpid(), i);
	snprintf(errf, sizeof errf, "/tmp/tsl_%d_e_%d", getpid(), i);

	FILE *f = fopen(src, "wb");
	if (!f) return -1;
	fputs(r->src, f);
	fclose(f);

	mkdir(tmpdir, 0755);
	snprintf(cmd, sizeof cmd, "cd %s && %s build %s >/dev/null 2>%s",
	    tmpdir, driver, src, errf);
	int brc = runwait(cmd);
	if (r->kind == K_BUILDERR) {
		int ok = (brc != 0)
		    && (r->experr == NULL || errlog_has(errf, r->experr));
		if (!ok)
			fprintf(stderr, "row[%s]: %s expected loud builderr "
			    "\"%s\" (brc=%d)\n", r->label, driver,
			    r->experr ? r->experr : "", brc);
		unlink(src); unlink(errf); rmdir(tmpdir);
		return ok ? 0 : 1;
	}
	if (brc != 0) {
		fprintf(stderr, "row[%s]: build via %s failed\n",
		    r->label, driver);
		unlink(src); unlink(errf); rmdir(tmpdir);
		return -1;
	}

	const char *base = strrchr(src, '/');
	base = base ? base + 1 : src;
	char outbin[256];
	snprintf(outbin, sizeof outbin, "%s/%s", tmpdir, base);
	char *dot = strrchr(outbin, '.');
	if (dot && strcmp(dot, ".ww") == 0) *dot = '\0';
	int got = runwait(outbin);

	unlink(src); unlink(outbin); unlink(errf); rmdir(tmpdir);
	if (got != r->want) {
		fprintf(stderr, "row[%s]: %s exit %d, want %d\n",
		    r->label, driver, got, r->want);
		return 1;
	}
	return 0;
}

/* cs==ww .s byte-id (rule 10). */
static int
asm_byte_identical(const char *bin, const struct row *r, int i)
{
	char src[96], cs[96], ws[96], cmd[1024];
	snprintf(src, sizeof src, "/tmp/tsl_asm_%d_%d.ww", getpid(), i);
	snprintf(cs,  sizeof cs,  "/tmp/tsl_asm_%d_%d_c.s", getpid(), i);
	snprintf(ws,  sizeof ws,  "/tmp/tsl_asm_%d_%d_w.s", getpid(), i);

	FILE *f = fopen(src, "wb");
	if (!f) return -1;
	fputs(r->src, f);
	fclose(f);

	snprintf(cmd, sizeof cmd, "%s/w6c -o %s %s 2>/dev/null", bin, cs, src);
	if (runwait(cmd) != 0) {
		fprintf(stderr, "row[%s]: w6c errored\n", r->label);
		unlink(src);
		return -1;
	}
	snprintf(cmd, sizeof cmd, "%s/w6c_ww -o %s %s 2>/dev/null",
	    bin, ws, src);
	if (runwait(cmd) != 0) {
		fprintf(stderr, "row[%s]: w6c_ww errored\n", r->label);
		unlink(src); unlink(cs);
		return -1;
	}
	int rc = slurp_eq(cs, ws);
	if (rc != 0)
		fprintf(stderr, "row[%s]: cstage vs wwstage asm differs\n",
		    r->label);
	unlink(src); unlink(cs); unlink(ws);
	return rc;
}

int
main(void)
{
	const char *bin = getenv("BIN");
	if (!bin) bin = "out/bin";
	char absbin[2080];
	if (bin[0] != '/') {
		char cwd[1024];
		if (getcwd(cwd, sizeof cwd) == NULL) return 1;
		snprintf(absbin, sizeof absbin, "%s/%s", cwd, bin);
		bin = absbin;
	}

	char cdrv[2120], wdrv[2120];
	snprintf(cdrv, sizeof cdrv, "%s/ww", bin);
	snprintf(wdrv, sizeof wdrv, "%s/ww_ww", bin);

	int n = (int)(sizeof rows / sizeof rows[0]);
	int total = 0, fail = 0;

	for (int i = 0; i < n; i++) {
		total++;
		if (run_driver(cdrv, &rows[i], i) != 0) fail++;
	}
	if (access(wdrv, X_OK) == 0) {
		for (int i = 0; i < n; i++) {
			total++;
			if (run_driver(wdrv, &rows[i], i) != 0) fail++;
		}
		for (int i = 0; i < n; i++) {
			if (rows[i].kind == K_BUILDERR)
				continue;
			total++;
			if (asm_byte_identical(bin, &rows[i], i) != 0) fail++;
		}
	}

	if (fail) {
		fprintf(stderr, "tuple_slot_layout: %d/%d checks failed\n",
		    fail, total);
		return 1;
	}
	printf("tuple_slot_layout: %d/%d ok\n", total, total);
	return 0;
}