ww/test/wcc/944_alias_cgen_b5_run.c

/*
 * 944_alias_cgen_b5_run — #5 alias arc F2b (B5 train): cstage cgen
 * helper + funnel internalization through type_chase_named (c1), the
 * #73 tripwire graduation (c2), the #89 cgreturn return-position widen
 * (c3) and the #93 deref-index pointee chase (c4). All cs-only: every
 * graduation is a DIVERGE→byte-id flip (cs aligns UP to ww's already-
 * chasing asm); zero selfhost/lib bytes move across the train, so the
 * _ww binaries stay bit-identical (the crossing detector).
 *
 * Row sources are ken's B5 oracle probes (/tmp/ken_b5/src,
 * .ai/ken-b5-oracle.md + its c1-BOUNDARY ADDENDUM) and the c3/c4
 * seeds (/tmp/ken_na, kb4).
 *
 *   row                 | shape (oracle row)                  | cs/ww
 *   --------------------+-------------------------------------+------
 *   signed_ctl          | kb5_signed: 2-lvl alias i8 field    |
 *                       | load (fld_issigned) — classifiers   |
 *                       | recurse, NO-mover control           | 0/0
 *   targ_2lvl           | kb5_targ: 2-lvl alias (void|i64)    |
 *                       | param ≤48B (tagged_arg_size) — was  |
 *                       | cs LIVE exit-1, c1 graduation       | 0/0
 *   tmem_2lvl           | kb5_tmem: >48B memarg twin          |
 *                       | (tagged_memarg_size) — graduation   | 0/0
 *   wpush_2lvl          | kb5_wpush: call-site widen, literal |
 *                       | arg (:2905 du) — divergence flip    | 0/0
 *   wstore_2lvl/_1lvl   | kb5_wstore/wstore1: let-route       |
 *                       | controls (du arrives chased         |
 *                       | upstream — ken FLAG-1), NEUTRAL     | 0/0
 *   wstore_a_bound_b6   | kb5_wstore_a: ASSIGN-route re-store |
 *                       | — both-correct divergent; the       |
 *                       | ident-lhs N_ASSIGN gates in the     |
 *                       | cgexpr INLINE set (B6), NOT the     |
 *                       | :2456 funnel (C1-CORR-2, corrects   |
 *                       | rob R2) — byte-id waived until B6   | 0/0
 *   succ_bound_c3       | kb5_succ: `?`-success remap over    |
 *                       | 2-lvl alias result — both-correct   |
 *                       | divergent at RETURN positions only  |
 *                       | (:12278/:12318/:12322 family,       |
 *                       | C1-CORR-1) — joins c3's graduation  |
 *                       | set; byte-id waived until c3        | 0/0
 *   null_2lvl           | kb5_null: nullable fold + deref     |
 *                       | (type_isnullable/nullable_ptr_tag)  |
 *                       | — divergence flip                   | 0/0
 *   f32p_2lvl           | kb5_f32p: nested 2-lvl-alias f64    |
 *                       | field struct param                  |
 *                       | (struct_float_class) — flip         | 0/0
 *   fill0_ctl           | kb5_fill0: named-struct array elem  |
 *                       | in struct lit — LOUD both stages    |
 *                       | (twin texts share the experr)       | err/err
 *   fill2_bound100      | kb5_fill2: 1-alias-lvl elem — was   |
 *                       | both-wrong-IDENTICAL gate-blind; c1 |
 *                       | :3195 chase flips cs LOUD, ww stays |
 *                       | silent-wrong exit 1. DESIGNED       |
 *                       | DIVERGENCE until the ww twin gate   |
 *                       | (task #100) lands — dual-cell pin   | err/1
 *   tuparg_bound99 /    | kb5_tuparg(1): literal named-tuple  |
 *   tuparg1_bound99     | arg — cs checker-rejects (#86-kin), |
 *                       | WW RUNS WRONG exit 1 (task #99,     |
 *                       | metric-1 ww side). Dual-cell pin    | err/1
 *   tuparg_cast_bound99 | kb5_tuparg_c: cast spelling dodges  |
 *                       | the cs checker; the :249 chase made |
 *                       | cs run CORRECT (LIVE c1 graduation, |
 *                       | C1-CORR-3 — corrects rob R3 + ken   |
 *                       | FLAG-2); ww still WRONG exit 1      |
 *                       | (#99). Two-key pin: cs-0 earned +   |
 *                       | ww-1 pinned-wrong; byte-id waived   |
 *                       | until #99 re-pins to full byte-id   | 0/1
 *   tupglobal_bound86   | kb5_tupglobal: alias-tuple global — |
 *                       | cs checker-dead (#86), ww runs 0.   |
 *                       | #85 type_unwrap close is SITE-      |
 *                       | closure with zero live graduations  |
 *                       | — this row pins the bound           | err/0
 *   ---- c2 (#73 graduation: tripwire deleted, 6 fu gates chased) --
 *   g73_idxstore /      | slice / str / tagged 2-lvl alias    |
 *   g73_strfield /      | field at the indexed-elem STORE     |
 *   g73_tagfield        | gate — pre = loud "#73" fatal       | 0/0
 *   g73_idxread /       | slice arm at the indexed-elem READ, |
 *   g73_ptrread /       | ptr-chain READ and tuple-elem READ  |
 *   g73_tupread         | gates — pre = loud "#73" fatal      | 0/0
 *   g73_static_struct   | nested-struct arm at the static     |
 *                       | struct-lit emit gate — pre = "#73"  | 0/0
 *   g73_heapfill        | str arm at the heap struct-lit fill |
 *                       | gate — COMPILE-only pin: bare /tmp  |
 *                       | programs never link malloc (both    |
 *                       | stages, pre-existing infra) and the |
 *                       | ww deref-field READ carries the     |
 *                       | #24-kin field(SB) leak, so run +    |
 *                       | byte-id cells are unavailable; the  |
 *                       | FILL bytes themselves verified      |
 *                       | byte-id by hand (= plain control)   | asm
 *   g73_static_str      | str-field static emit: the #73      |
 *                       | fatal gave way to the #129 A.2      |
 *                       | foldability loud — now fill0-class  |
 *                       | both-loud (twin texts)              | err/err
 *
 * K_RUN rows build+run BOTH drivers (cs exit==cswant, ww exit==wwwant)
 * and assert cstage/wwstage asm byte-id. K_RUN_NOID asserts both run
 * cells but waives byte-id — cite the blocking task/commit at the row.
 * K_CSERR_WWRUN is the dual-cell bound kind (the inverse of
 * 944_alias_accept_run's K_RUN_CS_WWERR): the cstage build must FAIL
 * with experr AND the wwstage build+run must exit wwwant — both cells
 * asserted so neither the cs loudness nor the ww behavior can drift
 * silently while the cited task is parked. NNN<950, self-contained
 * /tmp sources, no imports (944 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, exits==wants, + byte-id */
#define K_BUILDERR     1	/* build FAILS with experr on BOTH drivers */
#define K_RUN_NOID     2	/* build+run BOTH, exits==wants, byte-id
				 * SKIPPED — cite the blocking task */
#define K_CSERR_WWRUN  3	/* dual-cell bound row: cstage build must
				 * FAIL with experr; wwstage build+run,
				 * exit==wwwant — cite the blocking task */
#define K_COMPILES     4	/* w6c AND w6c_ww must COMPILE (no run, no
				 * byte-id) — cite why the other cells are
				 * unavailable at the row */

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

/* errlog_has — a builderr cell must fail WITH its diagnostic; any other
 * failure (parse error, crash, hang-kill) 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[] = {
	/* ---- c1: helper + funnel internalization (the F2c-cs fuse) */
	{ "signed_ctl",
	  "package main;\n"
	  "type s0 = i8;\n"
	  "type s1 = s0;\n"
	  "type st = struct { f: s1, g: s1 };\n"
	  "export fn main() i32 = {\n"
	  "	let x: st;\n"
	  "	x.f = -5;\n"
	  "	x.g = 3;\n"
	  "	if (x.f >= 0) { return 1; };\n"
	  "	let w: i64 = x.f: i64;\n"
	  "	if (w != -5) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, 0, K_RUN, NULL },
	/* LIVE c1 graduation: tagged_arg_size single-peeled the 2-level
	 * alias union param to 0 → wrong arg path (cs exit 1 SILENT, ww
	 * correct). */
	{ "targ_2lvl",
	  "package main;\n"
	  "type u0 = (void | i64);\n"
	  "type u = u0;\n"
	  "fn h(v: u) i32 = {\n"
	  "	match (v) {\n"
	  "	case let n: i64 => { if (n != 42) { return 1; }; return 0; };\n"
	  "	case void => { return 2; };\n"
	  "	};\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let x: u = 42i64;\n"
	  "	return h(x);\n"
	  "};\n", 0, 0, K_RUN, NULL },
	/* LIVE c1 graduation: the >48B MEMORY-class twin
	 * (tagged_memarg_size). LAST payload word checked. */
	{ "tmem_2lvl",
	  "package main;\n"
	  "type big = struct { a: i64, b: i64, c: i64, d: i64, e: i64, f: i64, g: i64 };\n"
	  "type m0 = (void | big);\n"
	  "type m = m0;\n"
	  "fn h(v: m) i32 = {\n"
	  "	match (v) {\n"
	  "	case let s: big => { if (s.g != 77) { return 1; }; return 0; };\n"
	  "	case void => { return 2; };\n"
	  "	};\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	let s: big;\n"
	  "	s.a = 11; s.b = 22; s.c = 33; s.d = 44; s.e = 55; s.f = 66; s.g = 77;\n"
	  "	let x: m = s;\n"
	  "	return h(x);\n"
	  "};\n", 0, 0, K_RUN, NULL },
	{ "wpush_2lvl",
	  "package main;\n"
	  "type u0 = (void | i64);\n"
	  "type u = u0;\n"
	  "fn h(v: u) i32 = {\n"
	  "	match (v) {\n"
	  "	case let n: i64 => { if (n != 42) { return 1; }; return 0; };\n"
	  "	case void => { return 2; };\n"
	  "	};\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	return h(42i64);\n"
	  "};\n", 0, 0, K_RUN, NULL },
	{ "wstore_2lvl",
	  "package main;\n"
	  "type u0 = (void | i64);\n"
	  "type u = u0;\n"
	  "export fn main() i32 = {\n"
	  "	let v: u = 42i64;\n"
	  "	match (v) {\n"
	  "	case let n: i64 => { if (n != 42) { return 1; }; };\n"
	  "	case void => { return 2; };\n"
	  "	};\n"
	  "	return 0;\n"
	  "};\n", 0, 0, K_RUN, NULL },
	{ "wstore_1lvl",
	  "package main;\n"
	  "type u = (void | i64);\n"
	  "export fn main() i32 = {\n"
	  "	let v: u = 42i64;\n"
	  "	match (v) {\n"
	  "	case let n: i64 => { if (n != 42) { return 1; }; };\n"
	  "	case void => { return 2; };\n"
	  "	};\n"
	  "	return 0;\n"
	  "};\n", 0, 0, K_RUN, NULL },
	/* C1-CORR-2 (ken c1-boundary addendum): the assign-route
	 * divergence does NOT close in this train — the ident-lhs
	 * N_ASSIGN tagged store gates in the cgexpr INLINE set (B6),
	 * never reaching the :2456 funnel. Both stages runtime-correct;
	 * byte-id rides B6. */
	{ "wstore_a_bound_b6",
	  "package main;\n"
	  "type u0 = (void | i64);\n"
	  "type u = u0;\n"
	  "export fn main() i32 = {\n"
	  "	let v: u = void;\n"
	  "	v = 42i64;\n"
	  "	match (v) {\n"
	  "	case let n: i64 => { if (n != 42) { return 1; }; };\n"
	  "	case void => { return 2; };\n"
	  "	};\n"
	  "	return 0;\n"
	  "};\n", 0, 0, K_RUN_NOID, NULL },	/* byte-id: B6 */
	/* C1-CORR-1: the residual divergence is exactly three paired
	 * return-position tag syntheses — the cgreturn return-route
	 * family (:12278/:12318/:12322). Joins c3's graduation set
	 * (pins-follow-the-layer); flips to K_RUN there. */
	{ "succ_bound_c3",
	  "package main;\n"
	  "type e0 = !i64;\n"
	  "type r0 = (i64 | e0);\n"
	  "type r = r0;\n"
	  "fn w(bad: bool) r = {\n"
	  "	if (bad) { return 7: e0; };\n"
	  "	return 42;\n"
	  "};\n"
	  "fn outer() r = {\n"
	  "	let v = w(false)?;\n"
	  "	return v + 1;\n"
	  "};\n"
	  "export fn main() i32 = {\n"
	  "	match (outer()) {\n"
	  "	case let n: i64 => { if (n != 43) { return 1; }; };\n"
	  "	case e0 => { return 2; };\n"
	  "	};\n"
	  "	return 0;\n"
	  "};\n", 0, 0, K_RUN_NOID, NULL },	/* byte-id: c3 */
	{ "null_2lvl",
	  "package main;\n"
	  "type np0 = (*i64 | void);\n"
	  "type np = np0;\n"
	  "export fn main() i32 = {\n"
	  "	let n: i64 = 31;\n"
	  "	let p: np = &n;\n"
	  "	match (p) {\n"
	  "	case let q: *i64 => { if (*q != 31) { return 1; }; };\n"
	  "	case void => { return 2; };\n"
	  "	};\n"
	  "	return 0;\n"
	  "};\n", 0, 0, K_RUN, NULL },
	{ "f32p_2lvl",
	  "package main;\n"
	  "type in0 = struct { a: f64 };\n"
	  "type in1 = in0;\n"
	  "type pt = struct { x: in1, y: f64 };\n"
	  "fn g(p: pt) f64 = { return p.x.a + p.y; };\n"
	  "export fn main() i32 = {\n"
	  "	let p: pt;\n"
	  "	p.x.a = 2.5;\n"
	  "	p.y = 1.5;\n"
	  "	if (g(p) != 4.0) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0, 0, K_RUN, NULL },
	/* fill loudness control: named-struct array elem louds on BOTH
	 * stages with twin texts — the experr substring is shared. */
	{ "fill0_ctl",
	  "package main;\n"
	  "type el0 = struct { a: i64 };\n"
	  "type S = struct { arr: [2]el0, n: i64 };\n"
	  "export fn main() i32 = {\n"
	  "	let s = S { arr = [el0 { a = 5 }, el0 { a = 6 }], n = 3 };\n"
	  "	if (s.arr[0].a + s.arr[1].a + s.n != 14) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0, 0, K_BUILDERR,
	  "has a str/slice/struct/tagged element" },
	/* DESIGNED IN-TRAIN ACCEPTANCE DIVERGENCE (B5 re-rule R4, task
	 * #100): pre-c1 this was both-wrong-IDENTICAL-silent (gate-blind
	 * #263 class — both stages accepted and ran exit 1 byte-id). The
	 * cs-only :3195 chase flips cs to the fill0 fatal; ww's own
	 * alias-blind twin gate (checkarrlitfits kin) stays silent-wrong
	 * until #100 lands — then this row graduates to a both-loud
	 * fill0-class pair. Both cells asserted. */
	{ "fill2_bound100",
	  "package main;\n"
	  "type el0 = struct { a: i64 };\n"
	  "type el = el0;\n"
	  "type S = struct { arr: [2]el, n: i64 };\n"
	  "export fn main() i32 = {\n"
	  "	let s = S { arr = [el0 { a = 5 }, el0 { a = 6 }], n = 3 };\n"
	  "	if (s.arr[0].a + s.arr[1].a + s.n != 14) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0, 1, K_CSERR_WWRUN,
	  "has a str/slice/struct/tagged element" },	/* ww: task #100 */
	/* node_tuplearg:249 pin (ken FLAG-2): the LITERAL spelling has
	 * NO GREEN TARGET — cs checker-rejects even at 1 level (#86-kin)
	 * while WW ACCEPTS AND RUNS WRONG (exit 1, task #99 metric-1
	 * ww-side). Cells pinned as observed. */
	{ "tuparg_bound99",
	  "package main;\n"
	  "type tp0 = (i64, i64);\n"
	  "type tp = tp0;\n"
	  "fn f(t: tp) i64 = { return t.0 + t.1; };\n"
	  "export fn main() i32 = {\n"
	  "	let t: tp = (4, 9);\n"
	  "	if (f(t) != 13) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0, 1, K_CSERR_WWRUN,
	  "not assignable" },	/* ww: task #99 */
	{ "tuparg1_bound99",	/* 1-LEVEL identical — not alias-depth */
	  "package main;\n"
	  "type tp = (i64, i64);\n"
	  "fn f(t: tp) i64 = { return t.0 + t.1; };\n"
	  "export fn main() i32 = {\n"
	  "	let t: tp = (4, 9);\n"
	  "	if (f(t) != 13) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0, 1, K_CSERR_WWRUN,
	  "not assignable" },	/* ww: task #99 */
	/* C1-CORR-3 (corrects rob R3 + ken FLAG-2): the CAST spelling
	 * dodges the cs checker, and the :249 chase gave it a LIVE cs
	 * graduation — cs now classifies the alias-tuple arg and runs
	 * CORRECT. ww still runs WRONG (#99). Two-key pin: cs-0 earned
	 * + ww-1 pinned OBSERVED-WRONG; byte-id waived — when #99's ww
	 * fix lands, the ww cell reds and forces the re-pin to full 0/0
	 * byte-id (the designed graduation path). */
	{ "tuparg_cast_bound99",
	  "package main;\n"
	  "type tp0 = (i64, i64);\n"
	  "type tp = tp0;\n"
	  "fn f(t: tp) i64 = { return t.0 + t.1; };\n"
	  "export fn main() i32 = {\n"
	  "	let t: tp = (4, 9): tp;\n"
	  "	if (f(t) != 13) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0, 1, K_RUN_NOID, NULL },	/* ww+byte-id: task #99 */
	/* #85 SITE-closure bound: type_unwrap's consumers (:14716/:14907
	 * tuple-global layout walks) are checker-DEAD on cs for alias
	 * tuples (#86 upstream) — the c1 chase graduates NOTHING live
	 * here; ww runs the global correctly. */
	{ "tupglobal_bound86",
	  "package main;\n"
	  "type tp0 = (i64, i64);\n"
	  "type tp = tp0;\n"
	  "let G: tp = (4, 9);\n"
	  "export fn main() i32 = {\n"
	  "	if (G.0 + G.1 != 13) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0, 0, K_CSERR_WWRUN,
	  "not assignable" },	/* cs: task #86 */
	/* ---- c2: #73 graduation — the F1 tripwire's containment
	 * replaced by the designed chase (close-by-construction). Each
	 * row was the loud "#73" fatal on cs at the c1 tip (ww ok/0);
	 * post-c2 the gates read the chased field type and every
	 * runnable arm lands 0/0 byte-id. Values exceed 255 / use the
	 * LAST element so a word0 tail can't pass by prefix-luck;
	 * noise() clobbers BX/CX on the read rows. */
	{ "g73_idxstore",
	  "package main;\n"
	  "type sl = []int;\n"
	  "type sl2 = sl;\n"
	  "type box = struct { s: sl2, n: int };\n"
	  "export fn main() i32 = {\n"
	  "	let a: [3]int = [700: int, 800: int, 900: int];\n"
	  "	let xs: [2]box;\n"
	  "	xs[0].s = a[0:3];\n"
	  "	if (xs[0].s.len != 3) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0, 0, K_RUN, NULL },
	{ "g73_strfield",
	  "package main;\n"
	  "type s1t = str;\n"
	  "type s2t = s1t;\n"
	  "type box = struct { s: s2t, n: int };\n"
	  "fn noise(x: int) int = { return x * 7 + 3; };\n"
	  "export fn main() i32 = {\n"
	  "	let xs: [2]box;\n"
	  "	xs[1].s = \"hello\";\n"
	  "	xs[1].n = 4;\n"
	  "	let k = noise(9);\n"
	  "	if (k != 66) { return 9; };\n"
	  "	let w = xs[1].s;\n"
	  "	if (w.len != 5) { return 1; };\n"
	  "	return 0;\n"
	  "};\n", 0, 0, K_RUN, NULL },
	{ "g73_tagfield",
	  "package main;\n"
	  "type tu0 = (void | i64);\n"
	  "type tu = tu0;\n"
	  "type box = struct { u: tu, n: int };\n"
	  "export fn main() i32 = {\n"
	  "	let xs: [2]box;\n"
	  "	xs[0].n = 5;\n"
	  "	xs[0].u = 42i64;\n"
	  "	if (xs[0].n != 5) { return 1; };\n"
	  "	match (xs[0].u) {\n"
	  "	case let v: i64 => { if (v != 42) { return 2; }; };\n"
	  "	case void => { return 3; };\n"
	  "	};\n"
	  "	return 0;\n"
	  "};\n", 0, 0, K_RUN, NULL },
	/* store rides the (F1-chased) single-dot via-ptr route so the
	 * indexed-elem READ gate fires in isolation. */
	{ "g73_idxread",
	  "package main;\n"
	  "type sl = []int;\n"
	  "type sl2 = sl;\n"
	  "type box = struct { s: sl2, n: int };\n"
	  "fn noise(x: int) int = { return x * 7 + 3; };\n"
	  "export fn main() i32 = {\n"
	  "	let a: [3]int = [700: int, 800: int, 900: int];\n"
	  "	let xs: [2]box;\n"
	  "	let p = &xs[1];\n"
	  "	p.s = a[0:3];\n"
	  "	p.n = 4;\n"
	  "	let k = noise(9);\n"
	  "	if (k != 66) { return 9; };\n"
	  "	let w = xs[1].s;\n"
	  "	if (w.len != 3) { return 1; };\n"
	  "	if (w[2] != 900) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, 0, K_RUN, NULL },
	{ "g73_ptrread",
	  "package main;\n"
	  "type sl = []int;\n"
	  "type sl2 = sl;\n"
	  "type inner = struct { s: sl2, n: int };\n"
	  "type outer = struct { pi: *inner };\n"
	  "fn noise(x: int) int = { return x * 7 + 3; };\n"
	  "export fn main() i32 = {\n"
	  "	let a: [3]int = [700: int, 800: int, 900: int];\n"
	  "	let i: inner;\n"
	  "	i.s = a[0:3];\n"
	  "	i.n = 1;\n"
	  "	let v: outer;\n"
	  "	v.pi = &i;\n"
	  "	let k = noise(9);\n"
	  "	if (k != 66) { return 9; };\n"
	  "	let w = v.pi.s;\n"
	  "	if (w.len != 3) { return 1; };\n"
	  "	if (w[2] != 900) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, 0, K_RUN, NULL },
	{ "g73_tupread",
	  "package main;\n"
	  "type sl = []int;\n"
	  "type sl2 = sl;\n"
	  "export fn main() i32 = {\n"
	  "	let a: [3]int = [700: int, 800: int, 900: int];\n"
	  "	let t: (sl2, int) = (a[0:3], 5);\n"
	  "	let s = t.0;\n"
	  "	if (s.len != 3) { return 1; };\n"
	  "	if (t.1 != 5) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, 0, K_RUN, NULL },
	{ "g73_static_struct",
	  "package main;\n"
	  "type in0 = struct { a: i64, b: i64 };\n"
	  "type in1 = in0;\n"
	  "type box = struct { i: in1, n: i64 };\n"
	  "let g: box = box { i = in0 { a = 4, b = 9 }, n = 5 };\n"
	  "export fn main() i32 = {\n"
	  "	if (g.n != 5) { return 1; };\n"
	  "	if (g.i.b != 9) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, 0, K_RUN, NULL },
	/* COMPILE-only pin: bare /tmp programs never link malloc (both
	 * stages, pre-existing infra) and the ww deref-field READ
	 * carries the #24-kin field(SB) leak — run + byte-id cells are
	 * unavailable. The chased FILL bytes were verified byte-id by
	 * hand against the plain control (/tmp/b5/work). Pre-c2 the cs
	 * cell was the "#73" fatal — this row pins its absence. */
	{ "g73_heapfill",
	  "package main;\n"
	  "type s1t = str;\n"
	  "type s2t = s1t;\n"
	  "type box = struct { s: s2t, n: int };\n"
	  "export fn main() i32 = {\n"
	  "	let p = alloc(box { s = \"hello\", n = 5 })!;\n"
	  "	if (p.n != 5) { return 1; };\n"
	  "	if (p.s.len != 5) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, 0, K_COMPILES, NULL },
	/* str-field static emit: the #73 fatal gave way to the
	 * pre-existing #129 A.2 foldability loud — both-loud twin texts
	 * now (the fill0 class), pinned so neither side regresses to a
	 * silent emit. */
	{ "g73_static_str",
	  "package main;\n"
	  "type s1t = str;\n"
	  "type s2t = s1t;\n"
	  "type box = struct { s: s2t, n: int };\n"
	  "let g: box = box { s = \"hello\", n = 5: int };\n"
	  "export fn main() i32 = {\n"
	  "	if (g.n != 5) { return 1; };\n"
	  "	if (g.s.len != 5) { return 2; };\n"
	  "	return 0;\n"
	  "};\n", 0, 0, K_BUILDERR,
	  "#129 A.2 scope" },
};

static int
run_driver(const char *driver, const struct row *r, int i, int expect_err,
    int want)
{
	char src[96], tmpdir[96], errf[96], cmd[1024];
	snprintf(src, sizeof src, "/tmp/ab5_%d_%d.ww", getpid(), i);
	snprintf(tmpdir, sizeof tmpdir, "/tmp/ab5_%d_d_%d", getpid(), i);
	snprintf(errf, sizeof errf, "/tmp/ab5_%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 && timeout 20 %s build %s >/dev/null 2>%s",
	    tmpdir, driver, src, errf);
	int brc = runwait(cmd);
	if (expect_err) {
		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 != want) {
		fprintf(stderr, "row[%s]: %s exit %d, want %d\n",
		    r->label, driver, got, want);
		return 1;
	}
	return 0;
}

/* asm_compiles — K_COMPILES cell: the named stage compiler must emit
 * asm without a fatal. */
static int
asm_compiles(const char *bin, const char *cc, const struct row *r, int i)
{
	char src[96], outs[96], cmd[1024];
	snprintf(src,  sizeof src,  "/tmp/ab5_cmp_%d_%d.ww", getpid(), i);
	snprintf(outs, sizeof outs, "/tmp/ab5_cmp_%d_%d.s", getpid(), i);

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

	snprintf(cmd, sizeof cmd, "%s/%s -o %s %s 2>/dev/null",
	    bin, cc, outs, src);
	int rc = runwait(cmd);
	if (rc != 0)
		fprintf(stderr, "row[%s]: %s failed to compile\n",
		    r->label, cc);
	unlink(src); unlink(outs);
	return rc != 0;
}

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/ab5_asm_%d_%d.ww", getpid(), i);
	snprintf(cs,  sizeof cs,  "/tmp/ab5_asm_%d_%d_c.s", getpid(), i);
	snprintf(ws,  sizeof ws,  "/tmp/ab5_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 (rows[i].kind == K_COMPILES) {
			if (asm_compiles(bin, "w6c", &rows[i], i) != 0)
				fail++;
			continue;
		}
		int cs_err = rows[i].kind == K_BUILDERR
		    || rows[i].kind == K_CSERR_WWRUN;
		if (run_driver(cdrv, &rows[i], i, cs_err,
		    rows[i].cswant) != 0) fail++;
	}
	if (access(wdrv, X_OK) == 0) {
		for (int i = 0; i < n; i++) {
			total++;
			if (rows[i].kind == K_COMPILES) {
				if (asm_compiles(bin, "w6c_ww",
				    &rows[i], i) != 0) fail++;
				continue;
			}
			int ww_err = rows[i].kind == K_BUILDERR;
			if (run_driver(wdrv, &rows[i], i, ww_err,
			    rows[i].wwwant) != 0) fail++;
		}
		for (int i = 0; i < n; i++) {
			if (rows[i].kind != K_RUN)
				continue;
			total++;
			if (asm_byte_identical(bin, &rows[i], i) != 0) fail++;
		}
	}

	if (fail) {
		fprintf(stderr, "alias_cgen_b5: %d/%d checks failed\n",
		    fail, total);
		return 1;
	}
	printf("alias_cgen_b5: %d/%d ok\n", total, total);
	return 0;
}