diff --git a/Makefile b/Makefile
index 9a25fb83..6d1bd546 100644
--- a/Makefile
+++ b/Makefile
@@ -353,8 +353,6 @@ TESTS	= $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
 	  $(BIN)/test_tryprop_tag_remap_run \
 	  $(BIN)/test_nullable_try_run \
 	  $(BIN)/test_nullable_assert_run \
-	  $(BIN)/test_idxfield_compound_run \
-	  $(BIN)/test_dotfield_compound_run \
 	  $(BIN)/test_nested_union_widen_run \
 	  $(BIN)/test_sret_struct_return \
 	  $(BIN)/test_tagged_sret_run \
@@ -2146,18 +2144,6 @@ $(BIN)/test_nullable_assert_run: test/wcc/949_nullable_assert_run.c \
 		$(LIB)/libwwrt.a | $(BIN)
 	$(CC) $(CFLAGS) -o $@ $<
 
-$(BIN)/test_idxfield_compound_run: test/wcc/949_idxfield_compound_run.c \
-		$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
-		$(BIN)/ww_ww $(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww \
-		$(LIB)/libwwrt.a | $(BIN)
-	$(CC) $(CFLAGS) -o $@ $<
-
-$(BIN)/test_dotfield_compound_run: test/wcc/949_dotfield_compound_run.c \
-		$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
-		$(BIN)/ww_ww $(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww \
-		$(LIB)/libwwrt.a | $(BIN)
-	$(CC) $(CFLAGS) -o $@ $<
-
 $(BIN)/test_sret_struct_return: test/wcc/721_sret_struct_return.c \
 		$(BIN)/w6c $(BIN)/w6c_ww | $(BIN)
 	$(CC) $(CFLAGS) -o $@ $<
@@ -3310,7 +3296,7 @@ test-lang: all
 LANGBYTEID_DIR		= $(OUT)/langbyteid
 LANGBYTEID_FILES	= $(wildcard test/lang/*_test.ww)
 LANGBYTEID_VERB		= test -c
-LANGBYTEID_EXPECTED_MIN	= 50
+LANGBYTEID_EXPECTED_MIN	= 52
 $(if $(LANGBYTEID_FILES),,$(error test-lang-byteid: empty corpus))
 test-lang-byteid: all
 	@set -e; \
diff --git a/test/lang/dotfield_compound_test.ww b/test/lang/dotfield_compound_test.ww
new file mode 100644
index 00000000..3e7385b4
--- /dev/null
+++ b/test/lang/dotfield_compound_test.ww
@@ -0,0 +1,123 @@
+// dotfield_compound_test — single-dot field compound-assign (#34, #263 both
+// stages), migrated from test/wcc/949_dotfield_compound_run.c. A compound
+// assign on a single-dot field lvalue (`s.f OP= v`, `p.f OP= v`, `g.f OP= v`,
+// `sl.len OP= v`) must do a real LOAD-OP-STORE for ALL ten integer ops, not
+// silently demote a non-+=/-= op to a plain `s.f = rhs` (the prior bug: *= /=
+// %= &= |= ^= <<= >>= left old-in-BX/rhs-in-AX then stored AX, so `s.f *= 3`
+// compiled to `s.f = 3`, gate-blind/byte-identical). Every row init-poisons
+// the field with a value != the expected result, runs the op, reads the field
+// back, and asserts the sibling field `g` (or the slice `.cap`) is UNTOUCHED to
+// catch an over-wide / wrong-offset store. PRIMITIVE-only asserts (no
+// fmt/strconv) so a co-miscompile in the assert path cannot mask the bug. The
+// matrix covers + * / % << >> across int/i32/u32 fields, a via-ptr base, a
+// global struct field, and the str/slice `.len` pseudo-field; the plain-assign
+// control pins the ASSIGN path the fix must leave unchanged. T2 keeps cs==ww.
+
+package dotfield_compound_test;
+
+type Sii = struct { f: int, g: int };
+type S32 = struct { f: i32, g: i32 };
+type Su32 = struct { f: u32, g: u32 };
+
+let gs: Sii = Sii{f=20, g=0};
+
+fn bump(p: *Sii) void = { p.f *= 3; };
+
+@test fn dotfld_pluseq_ctrl() void = {
+	let s: Sii = Sii{f=10, g=0};
+	s.f += 5;
+	assert(s.f == 15);
+	assert(s.g == 0);
+};
+
+@test fn dotfld_stareq() void = {
+	let s: Sii = Sii{f=5, g=0};
+	s.f *= 3;
+	assert(s.f == 15);
+	assert(s.g == 0);
+};
+
+@test fn dotfld_slasheq_signed() void = {
+	let s: Sii = Sii{f=100, g=0};
+	s.f /= 4;
+	assert(s.f == 25);
+	assert(s.g == 0);
+};
+
+@test fn dotfld_slasheq_neg() void = {
+	let s: S32 = S32{f=-17, g=0};
+	s.f /= 4;
+	assert(s.f == -4);
+	assert(s.g == 0);
+};
+
+@test fn dotfld_slasheq_unsigned() void = {
+	let s: Su32 = Su32{f=100u32, g=0u32};
+	s.f /= 4u32;
+	assert(s.f == 25u32);
+	assert(s.g == 0u32);
+};
+
+@test fn dotfld_percenteq() void = {
+	let s: Sii = Sii{f=17, g=0};
+	s.f %= 5;
+	assert(s.f == 2);
+	assert(s.g == 0);
+};
+
+@test fn dotfld_lshifteq() void = {
+	let s: Sii = Sii{f=3, g=0};
+	s.f <<= 4;
+	assert(s.f == 48);
+	assert(s.g == 0);
+};
+
+@test fn dotfld_rshifteq_neg() void = {
+	let s: S32 = S32{f=-16, g=0};
+	s.f >>= 2;
+	assert(s.f == -4);
+	assert(s.g == 0);
+};
+
+@test fn dotfld_rshifteq_unsigned() void = {
+	let s: Su32 = Su32{f=200u32, g=0u32};
+	s.f >>= 2u32;
+	assert(s.f == 50u32);
+	assert(s.g == 0u32);
+};
+
+@test fn dotfld_viaptr_stareq() void = {
+	let a: Sii = Sii{f=4, g=0};
+	bump(&a);
+	assert(a.f == 12);
+	assert(a.g == 0);
+};
+
+@test fn dotfld_global_slasheq() void = {
+	gs.f /= 4;
+	assert(gs.f == 5);
+	assert(gs.g == 0);
+};
+
+@test fn dotfld_pseudo_len_minuseq() void = {
+	let buf: [8]u8 = [1u8,2u8,3u8,4u8,5u8,6u8,7u8,8u8];
+	let sl: []u8 = buf[0:8];
+	sl.len -= 3;
+	assert(sl.len == 5);
+	assert(sl.cap == 8);
+};
+
+@test fn dotfld_pseudo_len_stareq() void = {
+	let buf: [8]u8 = [1u8,2u8,3u8,4u8,5u8,6u8,7u8,8u8];
+	let sl: []u8 = buf[0:4];
+	sl.len *= 3;
+	assert(sl.len == 12);
+	assert(sl.cap == 8);
+};
+
+@test fn dotfld_plain_assign_ctrl() void = {
+	let s: Sii = Sii{f=1, g=0};
+	s.f = 99;
+	assert(s.f == 99);
+	assert(s.g == 0);
+};
diff --git a/test/lang/idxfield_compound_test.ww b/test/lang/idxfield_compound_test.ww
new file mode 100644
index 00000000..6b131e4d
--- /dev/null
+++ b/test/lang/idxfield_compound_test.ww
@@ -0,0 +1,116 @@
+// idxfield_compound_test — indexed-element field compound-assign (#33, #263
+// both stages), migrated from test/wcc/949_idxfield_compound_run.c. A compound
+// assign on an indexed-element FIELD lvalue (`arr[i].field OP= v`) must do a
+// real LOAD-OP-STORE for ALL ten integer ops, not silently no-op the four the
+// arm never wired (SLASHEQ/PERCENTEQ/LSHIFTEQ/RSHIFTEQ loaded the old value
+// into AX, fired no combine, and stored AX back — a silent no-op in BOTH
+// stages, gate-blind/byte-identical). Every row init-poisons xs[0].f with a
+// value != the expected result, runs the op, reads the field back, and asserts
+// a sibling slot (xs[0].g or xs[1].f) is UNTOUCHED to catch an over-wide /
+// wrong-offset store. PRIMITIVE-only asserts (no fmt/strconv) so a co-
+// miscompile in the assert path cannot mask the bug. The matrix covers
+// + * / % << >> across i32/i64/u32 fields and a via-ptr element ([N]*S); the
+// plain-assign control pins the ASSIGN path the fix must leave unchanged. T2
+// keeps cs==ww.
+
+package idxfield_compound_test;
+
+type S32 = struct { f: i32, g: i32 };
+type S64 = struct { f: i64, g: i64 };
+type Su32 = struct { f: u32, g: u32 };
+
+@test fn fld_i32_pluseq() void = {
+	let xs: [2]S32 = [S32{f=100, g=0}, S32{f=0, g=0}];
+	xs[0].f += 50;
+	assert(xs[0].f == 150);
+	assert(xs[0].g == 0);
+	assert(xs[1].f == 0);
+};
+
+@test fn fld_i64_stareq() void = {
+	let xs: [2]S64 = [S64{f=6i64, g=0i64}, S64{f=0i64, g=0i64}];
+	xs[0].f *= 7i64;
+	assert(xs[0].f == 42i64);
+	assert(xs[0].g == 0i64);
+	assert(xs[1].f == 0i64);
+};
+
+@test fn fld_i32_slasheq() void = {
+	let xs: [2]S32 = [S32{f=100, g=0}, S32{f=0, g=0}];
+	xs[0].f /= 4;
+	assert(xs[0].f == 25);
+	assert(xs[0].g == 0);
+	assert(xs[1].f == 0);
+};
+
+@test fn fld_i32_slasheq_neg() void = {
+	let xs: [2]S32 = [S32{f=-17, g=0}, S32{f=0, g=0}];
+	xs[0].f /= 4;
+	assert(xs[0].f == -4);
+	assert(xs[0].g == 0);
+	assert(xs[1].f == 0);
+};
+
+@test fn fld_u32_slasheq() void = {
+	let xs: [2]Su32 = [Su32{f=100u32, g=0u32}, Su32{f=0u32, g=0u32}];
+	xs[0].f /= 4u32;
+	assert(xs[0].f == 25u32);
+	assert(xs[0].g == 0u32);
+	assert(xs[1].f == 0u32);
+};
+
+@test fn fld_i32_percenteq() void = {
+	let xs: [2]S32 = [S32{f=17, g=0}, S32{f=0, g=0}];
+	xs[0].f %= 5;
+	assert(xs[0].f == 2);
+	assert(xs[0].g == 0);
+	assert(xs[1].f == 0);
+};
+
+@test fn fld_u32_percenteq() void = {
+	let xs: [2]Su32 = [Su32{f=100u32, g=0u32}, Su32{f=0u32, g=0u32}];
+	xs[0].f %= 7u32;
+	assert(xs[0].f == 2u32);
+	assert(xs[0].g == 0u32);
+	assert(xs[1].f == 0u32);
+};
+
+@test fn fld_i32_lshifteq() void = {
+	let xs: [2]S32 = [S32{f=3, g=0}, S32{f=0, g=0}];
+	xs[0].f <<= 4;
+	assert(xs[0].f == 48);
+	assert(xs[0].g == 0);
+	assert(xs[1].f == 0);
+};
+
+@test fn fld_u32_rshifteq() void = {
+	let xs: [2]Su32 = [Su32{f=200u32, g=0u32}, Su32{f=0u32, g=0u32}];
+	xs[0].f >>= 2u32;
+	assert(xs[0].f == 50u32);
+	assert(xs[0].g == 0u32);
+	assert(xs[1].f == 0u32);
+};
+
+@test fn fld_i32_rshifteq_neg() void = {
+	let xs: [2]S32 = [S32{f=-16, g=0}, S32{f=0, g=0}];
+	xs[0].f >>= 2;
+	assert(xs[0].f == -4);
+	assert(xs[0].g == 0);
+	assert(xs[1].f == 0);
+};
+
+@test fn fld_viaptr_pluseq() void = {
+	let a: S32 = S32{f=10, g=0};
+	let xs: [2]*S32 = [&a, &a];
+	xs[0].f += 5;
+	assert(a.f == 15);
+	assert(a.g == 0);
+};
+
+@test fn fld_plain_assign_ctrl() void = {
+	let xs: [2]S32 = [S32{f=1, g=0}, S32{f=0, g=0}];
+	xs[0].f = 99;
+	assert(xs[0].f == 99);
+	assert(xs[0].g == 0);
+	assert(xs[1].f == 0);
+};
diff --git a/test/wcc/949_dotfield_compound_run.c b/test/wcc/949_dotfield_compound_run.c
deleted file mode 100644
index 849d4441..00000000
--- a/test/wcc/949_dotfield_compound_run.c
+++ /dev/null
@@ -1,390 +0,0 @@
-/*
- * 949_dotfield_compound_run — runtime + byte-id net for #34 (#263 both-
- * stages): a compound assign on a single-dot field lvalue
- * (`s.f OP= v`, `p.f OP= v`, `g.f OP= v`, `sl.len OP= v`) must do a real
- * LOAD-OP-STORE for ALL ten integer ops, not silently demote any op
- * other than += / -= to a plain `s.f = rhs`.
- *
- * Pre-fix: every single-dot field-compound arm in BOTH stages wired only
- * PLUSEQ/MINUSEQ; *= /= %= &= |= ^= <<= >>= left the old value in BX and
- * the rhs in AX, then fell into the generic store of AX — `s.f *= 3`
- * silently compiled to `s.f = 3` (gate-blind, .s byte-identical). The
- * five sub-arms (via-ptr-base local, direct struct local, str/slice
- * pseudo-field, global struct field) all shared the BX=old/AX=rhs
- * convention; the fix routes every one through one shared combine helper
- * (cgdotfieldcombine / cg_dotfield_combine) wiring all 10 ops and
- * hard-errors float/str/slice/tagged fields LOUD (rule-7). cs/ww move
- * together (#263 carve-out); byte-id witnesses rule-10.
- *
- * Each row carries (a) a cstage `ww build` + run asserting the exit code
- * and (b) a w6c vs w6c_ww `.s` cmp (rule-10 byte-id). builderr rows
- * assert BOTH stages fail loud with the cited diagnostic substring.
- */
-#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;
-}
-
-/* builderr + experr: when builderr != 0 the cstage build MUST FAIL and
- * stderr MUST contain experr. wwstage builderr is verified via direct
- * w6c_ww invocation on the same source. Mirrors 945_tuple_nary's pattern
- * for loud-stop verification (rule 7 — never silent). */
-struct row { const char *label; const char *src; int want_exit;
-             int builderr; const char *experr; };
-
-static const struct row rows[] = {
-	/* += control: the base op was already wired — byte-id surface
-	 * unchanged. 10 + 5 = 15. */
-	{ "dotfld_pluseq_ctrl",
-	  "package main;\n"
-	  "type S = struct { f: int, g: int };\n"
-	  "export fn main() i32 = {\n"
-	  "	let s: S = S{f=10, g=0};\n"
-	  "	s.f += 5;\n"
-	  "	return s.f: i32;\n"
-	  "};\n", 15, 0, NULL },
-	/* #34 newly-wired: direct struct local *= : 5 * 3 = 15. */
-	{ "dotfld_stareq",
-	  "package main;\n"
-	  "type S = struct { f: int, g: int };\n"
-	  "export fn main() i32 = {\n"
-	  "	let s: S = S{f=5, g=0};\n"
-	  "	s.f *= 3;\n"
-	  "	return s.f: i32;\n"
-	  "};\n", 15, 0, NULL },
-	/* signed /= : 100 / 4 = 25 (CQO+IDIVQ). */
-	{ "dotfld_slasheq_signed",
-	  "package main;\n"
-	  "type S = struct { f: int, g: int };\n"
-	  "export fn main() i32 = {\n"
-	  "	let s: S = S{f=100, g=0};\n"
-	  "	s.f /= 4;\n"
-	  "	return s.f: i32;\n"
-	  "};\n", 25, 0, NULL },
-	/* signed /= with a NEGATIVE dividend distinguishes IDIVQ from DIVQ:
-	 * -17 / 4 = -4 (CQO+IDIVQ, truncate toward zero); the positive signed
-	 * /= above cannot tell IDIVQ from DIVQ. return (-4 + 50) = 46. */
-	{ "dotfld_slasheq_neg",
-	  "package main;\n"
-	  "type S = struct { f: i32, g: i32 };\n"
-	  "export fn main() i32 = {\n"
-	  "	let s: S = S{f=-17, g=0};\n"
-	  "	s.f /= 4;\n"
-	  "	return s.f + 50;\n"
-	  "};\n", 46, 0, NULL },
-	/* unsigned u32 field /= : 100u32 / 4u32 = 25 (DIVQ + zero-DX). */
-	{ "dotfld_slasheq_unsigned",
-	  "package main;\n"
-	  "type S = struct { f: u32, g: u32 };\n"
-	  "export fn main() i32 = {\n"
-	  "	let s: S = S{f=100u32, g=0u32};\n"
-	  "	s.f /= 4u32;\n"
-	  "	return s.f: i32;\n"
-	  "};\n", 25, 0, NULL },
-	/* signed %= : 17 % 5 = 2 (result rides DX, MOVQ DX,AX). */
-	{ "dotfld_percenteq",
-	  "package main;\n"
-	  "type S = struct { f: int, g: int };\n"
-	  "export fn main() i32 = {\n"
-	  "	let s: S = S{f=17, g=0};\n"
-	  "	s.f %= 5;\n"
-	  "	return s.f: i32;\n"
-	  "};\n", 2, 0, NULL },
-	/* <<= : 3 << 4 = 48 (count swapped into CX, value into AX, SHLQ). */
-	{ "dotfld_lshifteq",
-	  "package main;\n"
-	  "type S = struct { f: int, g: int };\n"
-	  "export fn main() i32 = {\n"
-	  "	let s: S = S{f=3, g=0};\n"
-	  "	s.f <<= 4;\n"
-	  "	return s.f: i32;\n"
-	  "};\n", 48, 0, NULL },
-	/* signed >>= on a NEGATIVE i32 field: -16 >> 2 = -4 ARITHMETIC
-	 * (SARQ). return (-4 + 50) = 46 distinguishes from a logical shift. */
-	{ "dotfld_rshifteq_neg",
-	  "package main;\n"
-	  "type S = struct { f: i32, g: i32 };\n"
-	  "export fn main() i32 = {\n"
-	  "	let s: S = S{f=-16, g=0};\n"
-	  "	s.f >>= 2;\n"
-	  "	return s.f + 50;\n"
-	  "};\n", 46, 0, NULL },
-	/* unsigned u32 field >>= : 200u32 >> 2 = 50 (SHRQ). */
-	{ "dotfld_rshifteq_unsigned",
-	  "package main;\n"
-	  "type S = struct { f: u32, g: u32 };\n"
-	  "export fn main() i32 = {\n"
-	  "	let s: S = S{f=200u32, g=0u32};\n"
-	  "	s.f >>= 2u32;\n"
-	  "	return s.f: i32;\n"
-	  "};\n", 50, 0, NULL },
-	/* via-ptr base (`p.f` where p is *S fn param): the arm derefs the
-	 * pointer before the field load/store. 4 * 3 = 12. */
-	{ "dotfld_viaptr_stareq",
-	  "package main;\n"
-	  "type S = struct { f: int, g: int };\n"
-	  "fn bump(p: *S) void = { p.f *= 3; };\n"
-	  "export fn main() i32 = {\n"
-	  "	let a: S = S{f=4, g=0};\n"
-	  "	bump(&a);\n"
-	  "	return a.f: i32;\n"
-	  "};\n", 12, 0, NULL },
-	/* global struct field: gs.f /= 4 → 5 (LEAQ gs(SB) base). */
-	{ "dotfld_global_slasheq",
-	  "package main;\n"
-	  "type S = struct { f: int, g: int };\n"
-	  "let gs: S = S{f=20, g=0};\n"
-	  "export fn main() i32 = {\n"
-	  "	gs.f /= 4;\n"
-	  "	return gs.f: i32;\n"
-	  "};\n", 5, 0, NULL },
-	/* str/slice pseudo-field compound (`sl.len -= 3`): the pseudo-field
-	 * arm (delta = 8 for .len) must combine, not store the rhs. 8-3 = 5. */
-	{ "dotfld_pseudo_len_minuseq",
-	  "package main;\n"
-	  "export fn main() i32 = {\n"
-	  "	let buf: [8]u8 = [1u8,2u8,3u8,4u8,5u8,6u8,7u8,8u8];\n"
-	  "	let sl: []u8 = buf[0:8];\n"
-	  "	sl.len -= 3;\n"
-	  "	return sl.len: i32;\n"
-	  "};\n", 5, 0, NULL },
-	/* pseudo-field *= (the silently-demoted op): 4 * 3 = 12. */
-	{ "dotfld_pseudo_len_stareq",
-	  "package main;\n"
-	  "export fn main() i32 = {\n"
-	  "	let buf: [8]u8 = [1u8,2u8,3u8,4u8,5u8,6u8,7u8,8u8];\n"
-	  "	let sl: []u8 = buf[0:4];\n"
-	  "	sl.len *= 3;\n"
-	  "	return sl.len: i32;\n"
-	  "};\n", 12, 0, NULL },
-	/* Plain `s.f = v` control: ASSIGN path byte-id unchanged. */
-	{ "dotfld_plain_assign_ctrl",
-	  "package main;\n"
-	  "type S = struct { f: int, g: int };\n"
-	  "export fn main() i32 = {\n"
-	  "	let s: S = S{f=1, g=0};\n"
-	  "	s.f = 99;\n"
-	  "	return s.f: i32;\n"
-	  "};\n", 99, 0, NULL },
-	/* HARD-ERROR rows (#34/rule-7): float/str/slice/tagged FIELD compound
-	 * builds MUST FAIL LOUD on both stages with the cited diagnostic. */
-	{ "dotfld_he_float",
-	  "package main;\n"
-	  "type S = struct { f: f64, g: int };\n"
-	  "export fn main() i32 = {\n"
-	  "	let s: S = S{f=1.0, g=0};\n"
-	  "	s.f *= 2.0;\n"
-	  "	return 0;\n"
-	  "};\n", 0, 1, "single-dot field compound on float field" },
-	{ "dotfld_he_str",
-	  "package main;\n"
-	  "type S = struct { f: str, g: int };\n"
-	  "export fn main() i32 = {\n"
-	  "	let s: S = S{f=\"a\", g=0};\n"
-	  "	s.f += \"x\";\n"
-	  "	return 0;\n"
-	  "};\n", 0, 1, "single-dot field compound on str field" },
-	{ "dotfld_he_slice",
-	  "package main;\n"
-	  "type S = struct { f: []u8, g: int };\n"
-	  "export fn main() i32 = {\n"
-	  "	let b: [2]u8 = [1u8, 2u8];\n"
-	  "	let s: S = S{f=b[0:2], g=0};\n"
-	  "	s.f += b[0:1];\n"
-	  "	return 0;\n"
-	  "};\n", 0, 1, "single-dot field compound on slice field" },
-	{ "dotfld_he_tagged",
-	  "package main;\n"
-	  "type S = struct { f: (i32|str), g: int };\n"
-	  "export fn main() i32 = {\n"
-	  "	let s: S = S{f=1, g=0};\n"
-	  "	s.f += 3;\n"
-	  "	return 0;\n"
-	  "};\n", 0, 1, "single-dot field compound on tagged field" },
-	{ NULL, NULL, 0, 0, NULL }
-};
-
-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);
-		int cb = fgetc(fb);
-		if (ca != cb) { rc = -1; break; }
-		if (ca == EOF) break;
-	}
-	fclose(fa); fclose(fb);
-	return rc;
-}
-
-int
-main(void)
-{
-	const char *bin = getenv("BIN");
-	if (!bin) bin = "out/bin";
-	char absbin[1024];
-	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 w6c[1100], w6c_ww[1100];
-	snprintf(w6c, sizeof w6c, "%s/w6c", bin);
-	snprintf(w6c_ww, sizeof w6c_ww, "%s/w6c_ww", bin);
-	if (access(w6c_ww, X_OK) != 0) {
-		fprintf(stderr, "idxcompound: w6c_ww missing — cannot run the "
-		    "cs==ww byte-id gate (the whole point of this test)\n");
-		return 1;
-	}
-
-	int n = 0, fail = 0;
-	for (int i = 0; rows[i].src; i++, n++) {
-		char src[64];
-		snprintf(src, sizeof src, "/tmp/wwidx_%d_%d.ww", getpid(), i);
-		FILE *f = fopen(src, "wb");
-		if (f == NULL) { fail++; continue; }
-		fputs(rows[i].src, f);
-		fclose(f);
-
-		/* (a) cstage build + run, OR build-must-fail (builderr rows).
-		 * For builderr: stderr captured to a temp file; pass iff
-		 * exit-nonzero AND stderr contains experr substring. */
-		char tmpdir[64];
-		snprintf(tmpdir, sizeof tmpdir, "/tmp/wwidx_%d_d_%d",
-		    getpid(), i);
-		mkdir(tmpdir, 0755);
-
-		char cmd[2048];
-		if (rows[i].builderr) {
-			char errf[96];
-			snprintf(errf, sizeof errf, "/tmp/wwidx_%d_e_%d",
-			    getpid(), i);
-			snprintf(cmd, sizeof cmd,
-			    "cd %s && %s/ww build %s >/dev/null 2>%s",
-			    tmpdir, bin, src, errf);
-			int brc = runwait(cmd);
-			FILE *ef = fopen(errf, "rb");
-			char ebuf[4096];
-			size_t en = 0;
-			if (ef) { en = fread(ebuf, 1, sizeof ebuf - 1, ef);
-			    fclose(ef); }
-			ebuf[en] = '\0';
-			int ok = (brc != 0)
-			    && (rows[i].experr == NULL
-			        || strstr(ebuf, rows[i].experr) != NULL);
-			if (!ok) {
-				fprintf(stderr, "row[%s]: cstage expected "
-				    "builderr+'%s' (brc=%d, stderr='%s')\n",
-				    rows[i].label,
-				    rows[i].experr ? rows[i].experr : "(any)",
-				    brc, ebuf);
-				fail++;
-			}
-
-			/* Also verify wwstage hard-errors with the SAME message
-			 * (rule-10 — both stages identical diagnostic). Invoke
-			 * w6c_ww directly on the .ww source. */
-			snprintf(cmd, sizeof cmd,
-			    "%s -o /dev/null %s >/dev/null 2>%s",
-			    w6c_ww, src, errf);
-			int wrc = runwait(cmd);
-			ef = fopen(errf, "rb"); en = 0;
-			if (ef) { en = fread(ebuf, 1, sizeof ebuf - 1, ef);
-			    fclose(ef); }
-			ebuf[en] = '\0';
-			int wok = (wrc != 0)
-			    && (rows[i].experr == NULL
-			        || strstr(ebuf, rows[i].experr) != NULL);
-			if (!wok) {
-				fprintf(stderr, "row[%s]: wwstage expected "
-				    "builderr+'%s' (wrc=%d, stderr='%s')\n",
-				    rows[i].label,
-				    rows[i].experr ? rows[i].experr : "(any)",
-				    wrc, ebuf);
-				fail++;
-			}
-			unlink(errf);
-			unlink(src); rmdir(tmpdir);
-			continue;
-		}
-
-		snprintf(cmd, sizeof cmd, "cd %s && %s/ww build %s",
-		    tmpdir, bin, src);
-		if (runwait(cmd) != 0) {
-			fprintf(stderr, "row[%s]: cstage build failed\n",
-			    rows[i].label);
-			fail++;
-			unlink(src); rmdir(tmpdir);
-			continue;
-		}
-
-		char outbin[128];
-		const char *base = strrchr(src, '/');
-		base = base ? base + 1 : src;
-		snprintf(outbin, sizeof outbin, "%s/%s", tmpdir, base);
-		char *dot = strrchr(outbin, '.');
-		if (dot && strcmp(dot, ".ww") == 0) *dot = '\0';
-
-		int got = runwait(outbin);
-		if (got != rows[i].want_exit) {
-			fprintf(stderr, "row[%s]: cstage exit %d, want %d\n",
-			    rows[i].label, got, rows[i].want_exit);
-			fail++;
-		}
-		unlink(outbin); rmdir(tmpdir);
-
-		/* (b) cs==ww byte-id gate. */
-		char cs_s[64], ws_s[64];
-		snprintf(cs_s, sizeof cs_s, "/tmp/wwidx_%d_%d_cs.s",
-		    getpid(), i);
-		snprintf(ws_s, sizeof ws_s, "/tmp/wwidx_%d_%d_ww.s",
-		    getpid(), i);
-
-		snprintf(cmd, sizeof cmd, "%s -o %s %s 2>/dev/null",
-		    w6c, cs_s, src);
-		if (runwait(cmd) != 0) {
-			fprintf(stderr, "row[%s]: w6c failed\n", rows[i].label);
-			fail++; unlink(src); continue;
-		}
-		snprintf(cmd, sizeof cmd, "%s -o %s %s 2>/dev/null",
-		    w6c_ww, ws_s, src);
-		if (runwait(cmd) != 0) {
-			fprintf(stderr, "row[%s]: w6c_ww failed\n",
-			    rows[i].label);
-			fail++; unlink(src); unlink(cs_s); continue;
-		}
-		if (slurp_eq(cs_s, ws_s) != 0) {
-			fprintf(stderr,
-			    "row[%s]: cstage/wwstage .s DIFFER (rule-10 "
-			    "byte-id violation)\n", rows[i].label);
-			fail++;
-		}
-		unlink(src); unlink(cs_s); unlink(ws_s);
-	}
-
-	if (fail) {
-		fprintf(stderr, "%d/%d dotfield-compound tests failed\n",
-		    fail, n);
-		return 1;
-	}
-	printf("dotfield-compound: %d/%d ok (cstage run + cs==ww byte-id)\n",
-	    n, n);
-	return 0;
-}
diff --git a/test/wcc/949_idxfield_compound_run.c b/test/wcc/949_idxfield_compound_run.c
deleted file mode 100644
index 68f9f090..00000000
--- a/test/wcc/949_idxfield_compound_run.c
+++ /dev/null
@@ -1,373 +0,0 @@
-/*
- * 949_idxfield_compound_run — runtime + byte-id net for #33 (#263 both-
- * stages): a compound assign on an indexed-element FIELD lvalue
- * (`arr[i].field OP= v`) must do a real LOAD-OP-STORE for ALL ten integer
- * ops, not silently no-op the four the arm never wired.
- *
- * Pre-fix: the arr[i].field compound arm (cgenexpr.ww + cgen.c) wired only
- * PLUSEQ/MINUSEQ/STAREQ/AMPEQ/PIPEEQ/CARETEQ; for SLASHEQ/PERCENTEQ/
- * LSHIFTEQ/RSHIFTEQ the old field value loaded into AX, no combine fired,
- * and AX was stored back — a silent no-op in BOTH stages (gate-blind,
- * .s byte-identical). float/str/slice/tagged field compound on this arm
- * was also unguarded (silent fall-through). The fix wires all 10 ops
- * (SLASHEQ/PERCENTEQ via CQO+IDIVQ signed / zero-DX+DIVQ unsigned;
- * LSHIFTEQ via SHLQ; RSHIFTEQ via SARQ signed / SHRQ unsigned) and
- * hard-errors the 4 unwired payload kinds LOUD (rule-7) — mirroring the
- * #133 indexed-scalar + chained-ptr-field arms. cs/ww move together
- * (#263 carve-out); byte-id witnesses rule-10.
- *
- * Each row carries (a) a cstage `ww build` + run asserting the exit code
- * and (b) a w6c vs w6c_ww `.s` cmp (rule-10 byte-id). builderr rows assert
- * BOTH stages fail loud with the cited diagnostic substring.
- */
-#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;
-}
-
-/* builderr + experr: when builderr != 0 the cstage build MUST FAIL and
- * stderr MUST contain experr. wwstage builderr is verified via direct
- * w6c_ww invocation on the same source. Mirrors 945_tuple_nary's pattern
- * for loud-stop verification (rule 7 — never silent). */
-struct row { const char *label; const char *src; int want_exit;
-             int builderr; const char *experr; };
-
-static const struct row rows[] = {
-	/* The 6 base ops were already wired; control row that the
-	 * load-op-store surface is unchanged. 100 + 50 = 150. */
-	{ "fld_i32_pluseq",
-	  "package main;\n"
-	  "type S = struct { f: i32, g: i32 };\n"
-	  "export fn main() i32 = {\n"
-	  "	let xs: [2]S = [S{f=100, g=0}, S{f=0, g=0}];\n"
-	  "	xs[0].f += 50;\n"
-	  "	return xs[0].f;\n"
-	  "};\n", 150, 0, NULL },
-	/* i64 field *= : full-width. 6 * 7 = 42. */
-	{ "fld_i64_stareq",
-	  "package main;\n"
-	  "type S = struct { f: i64, g: i64 };\n"
-	  "export fn main() i32 = {\n"
-	  "	let xs: [2]S = [S{f=6i64, g=0i64}, S{f=0i64, g=0i64}];\n"
-	  "	xs[0].f *= 7i64;\n"
-	  "	return xs[0].f: i32;\n"
-	  "};\n", 42, 0, NULL },
-	/* #33 newly-wired: signed i32 /= : 100 / 4 = 25. */
-	{ "fld_i32_slasheq",
-	  "package main;\n"
-	  "type S = struct { f: i32, g: i32 };\n"
-	  "export fn main() i32 = {\n"
-	  "	let xs: [2]S = [S{f=100, g=0}, S{f=0, g=0}];\n"
-	  "	xs[0].f /= 4;\n"
-	  "	return xs[0].f;\n"
-	  "};\n", 25, 0, NULL },
-	/* signed /= with a NEGATIVE dividend: -17 / 4 = -4 ARITHMETIC
-	 * (CQO+IDIVQ truncates toward zero); an unsigned DIVQ on the
-	 * sign-extended -17 yields garbage. This is the row the positive
-	 * signed /= above cannot tell apart from DIVQ. return (-4+50)=46. */
-	{ "fld_i32_slasheq_neg",
-	  "package main;\n"
-	  "type S = struct { f: i32, g: i32 };\n"
-	  "export fn main() i32 = {\n"
-	  "	let xs: [2]S = [S{f=-17, g=0}, S{f=0, g=0}];\n"
-	  "	xs[0].f /= 4;\n"
-	  "	return xs[0].f + 50;\n"
-	  "};\n", 46, 0, NULL },
-	/* unsigned u32 /= : 100u32 / 4u32 = 25 (DIVQ + zero-DX, not IDIVQ). */
-	{ "fld_u32_slasheq",
-	  "package main;\n"
-	  "type S = struct { f: u32, g: u32 };\n"
-	  "export fn main() i32 = {\n"
-	  "	let xs: [2]S = [S{f=100u32, g=0u32}, S{f=0u32, g=0u32}];\n"
-	  "	xs[0].f /= 4u32;\n"
-	  "	return xs[0].f: i32;\n"
-	  "};\n", 25, 0, NULL },
-	/* signed i32 %= : 17 % 5 = 2 (result rides DX, MOVQ DX,AX). */
-	{ "fld_i32_percenteq",
-	  "package main;\n"
-	  "type S = struct { f: i32, g: i32 };\n"
-	  "export fn main() i32 = {\n"
-	  "	let xs: [2]S = [S{f=17, g=0}, S{f=0, g=0}];\n"
-	  "	xs[0].f %= 5;\n"
-	  "	return xs[0].f;\n"
-	  "};\n", 2, 0, NULL },
-	/* unsigned u32 %= : 100u32 % 7u32 = 2. */
-	{ "fld_u32_percenteq",
-	  "package main;\n"
-	  "type S = struct { f: u32, g: u32 };\n"
-	  "export fn main() i32 = {\n"
-	  "	let xs: [2]S = [S{f=100u32, g=0u32}, S{f=0u32, g=0u32}];\n"
-	  "	xs[0].f %= 7u32;\n"
-	  "	return xs[0].f: i32;\n"
-	  "};\n", 2, 0, NULL },
-	/* i32 <<= : 3 << 4 = 48 (SHLQ via CX). */
-	{ "fld_i32_lshifteq",
-	  "package main;\n"
-	  "type S = struct { f: i32, g: i32 };\n"
-	  "export fn main() i32 = {\n"
-	  "	let xs: [2]S = [S{f=3, g=0}, S{f=0, g=0}];\n"
-	  "	xs[0].f <<= 4;\n"
-	  "	return xs[0].f;\n"
-	  "};\n", 48, 0, NULL },
-	/* unsigned u32 >>= : 200u32 >> 2 = 50 (SHRQ). */
-	{ "fld_u32_rshifteq",
-	  "package main;\n"
-	  "type S = struct { f: u32, g: u32 };\n"
-	  "export fn main() i32 = {\n"
-	  "	let xs: [2]S = [S{f=200u32, g=0u32}, S{f=0u32, g=0u32}];\n"
-	  "	xs[0].f >>= 2u32;\n"
-	  "	return xs[0].f: i32;\n"
-	  "};\n", 50, 0, NULL },
-	/* signed i32 >>= on a NEGATIVE value: -16 >> 2 = -4 ARITHMETIC
-	 * (SARQ, not SHRQ — a logical shift would give a huge positive).
-	 * return (-4 + 50) = 46 distinguishes the two. */
-	{ "fld_i32_rshifteq_neg",
-	  "package main;\n"
-	  "type S = struct { f: i32, g: i32 };\n"
-	  "export fn main() i32 = {\n"
-	  "	let xs: [2]S = [S{f=-16, g=0}, S{f=0, g=0}];\n"
-	  "	xs[0].f >>= 2;\n"
-	  "	return xs[0].f + 50;\n"
-	  "};\n", 46, 0, NULL },
-	/* via-ptr element (`[N]*S`): the arm derefs once before the field
-	 * load/store. 10 + 5 = 15. */
-	{ "fld_viaptr_pluseq",
-	  "package main;\n"
-	  "type S = struct { f: i32, g: i32 };\n"
-	  "export fn main() i32 = {\n"
-	  "	let a = S{f=10, g=0};\n"
-	  "	let xs: [2]*S = [&a, &a];\n"
-	  "	xs[0].f += 5;\n"
-	  "	return a.f;\n"
-	  "};\n", 15, 0, NULL },
-	/* Plain `arr[i].field = v` control: ASSIGN path byte-id unchanged. */
-	{ "fld_plain_assign_ctrl",
-	  "package main;\n"
-	  "type S = struct { f: i32, g: i32 };\n"
-	  "export fn main() i32 = {\n"
-	  "	let xs: [2]S = [S{f=1, g=0}, S{f=0, g=0}];\n"
-	  "	xs[0].f = 99;\n"
-	  "	return xs[0].f;\n"
-	  "};\n", 99, 0, NULL },
-	/* HARD-ERROR rows (#33/rule-7): float/str/slice/tagged FIELD compound
-	 * builds MUST FAIL LOUD on both stages with the cited diagnostic. */
-	{ "fld_he_float",
-	  "package main;\n"
-	  "type S = struct { f: f64, g: i32 };\n"
-	  "export fn main() i32 = {\n"
-	  "	let xs: [2]S = [S{f=1.0, g=0}, S{f=0.0, g=0}];\n"
-	  "	xs[0].f /= 2.0;\n"
-	  "	return 0;\n"
-	  "};\n", 0, 1, "arr[i].field compound on float field" },
-	{ "fld_he_str",
-	  "package main;\n"
-	  "type S = struct { f: str, g: i32 };\n"
-	  "export fn main() i32 = {\n"
-	  "	let xs: [2]S = [S{f=\"a\", g=0}, S{f=\"b\", g=0}];\n"
-	  "	xs[0].f += \"x\";\n"
-	  "	return 0;\n"
-	  "};\n", 0, 1, "arr[i].field compound on str field" },
-	{ "fld_he_slice",
-	  "package main;\n"
-	  "type S = struct { f: []u8, g: i32 };\n"
-	  "export fn main() i32 = {\n"
-	  "	let b: [2]u8 = [1u8, 2u8];\n"
-	  "	let xs: [2]S = [S{f=b[0:2], g=0}, S{f=b[0:2], g=0}];\n"
-	  "	xs[0].f += b[0:1];\n"
-	  "	return 0;\n"
-	  "};\n", 0, 1, "arr[i].field compound on slice field" },
-	{ "fld_he_tagged",
-	  "package main;\n"
-	  "type S = struct { f: (i32|str), g: i32 };\n"
-	  "export fn main() i32 = {\n"
-	  "	let xs: [2]S = [S{f=1, g=0}, S{f=2, g=0}];\n"
-	  "	xs[0].f += 3;\n"
-	  "	return 0;\n"
-	  "};\n", 0, 1, "arr[i].field compound on tagged field" },
-	{ NULL, NULL, 0, 0, NULL }
-};
-
-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);
-		int cb = fgetc(fb);
-		if (ca != cb) { rc = -1; break; }
-		if (ca == EOF) break;
-	}
-	fclose(fa); fclose(fb);
-	return rc;
-}
-
-int
-main(void)
-{
-	const char *bin = getenv("BIN");
-	if (!bin) bin = "out/bin";
-	char absbin[1024];
-	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 w6c[1100], w6c_ww[1100];
-	snprintf(w6c, sizeof w6c, "%s/w6c", bin);
-	snprintf(w6c_ww, sizeof w6c_ww, "%s/w6c_ww", bin);
-	if (access(w6c_ww, X_OK) != 0) {
-		fprintf(stderr, "idxcompound: w6c_ww missing — cannot run the "
-		    "cs==ww byte-id gate (the whole point of this test)\n");
-		return 1;
-	}
-
-	int n = 0, fail = 0;
-	for (int i = 0; rows[i].src; i++, n++) {
-		char src[64];
-		snprintf(src, sizeof src, "/tmp/wwidx_%d_%d.ww", getpid(), i);
-		FILE *f = fopen(src, "wb");
-		if (f == NULL) { fail++; continue; }
-		fputs(rows[i].src, f);
-		fclose(f);
-
-		/* (a) cstage build + run, OR build-must-fail (builderr rows).
-		 * For builderr: stderr captured to a temp file; pass iff
-		 * exit-nonzero AND stderr contains experr substring. */
-		char tmpdir[64];
-		snprintf(tmpdir, sizeof tmpdir, "/tmp/wwidx_%d_d_%d",
-		    getpid(), i);
-		mkdir(tmpdir, 0755);
-
-		char cmd[2048];
-		if (rows[i].builderr) {
-			char errf[96];
-			snprintf(errf, sizeof errf, "/tmp/wwidx_%d_e_%d",
-			    getpid(), i);
-			snprintf(cmd, sizeof cmd,
-			    "cd %s && %s/ww build %s >/dev/null 2>%s",
-			    tmpdir, bin, src, errf);
-			int brc = runwait(cmd);
-			FILE *ef = fopen(errf, "rb");
-			char ebuf[4096];
-			size_t en = 0;
-			if (ef) { en = fread(ebuf, 1, sizeof ebuf - 1, ef);
-			    fclose(ef); }
-			ebuf[en] = '\0';
-			int ok = (brc != 0)
-			    && (rows[i].experr == NULL
-			        || strstr(ebuf, rows[i].experr) != NULL);
-			if (!ok) {
-				fprintf(stderr, "row[%s]: cstage expected "
-				    "builderr+'%s' (brc=%d, stderr='%s')\n",
-				    rows[i].label,
-				    rows[i].experr ? rows[i].experr : "(any)",
-				    brc, ebuf);
-				fail++;
-			}
-
-			/* Also verify wwstage hard-errors with the SAME message
-			 * (rule-10 — both stages identical diagnostic). Invoke
-			 * w6c_ww directly on the .ww source. */
-			snprintf(cmd, sizeof cmd,
-			    "%s -o /dev/null %s >/dev/null 2>%s",
-			    w6c_ww, src, errf);
-			int wrc = runwait(cmd);
-			ef = fopen(errf, "rb"); en = 0;
-			if (ef) { en = fread(ebuf, 1, sizeof ebuf - 1, ef);
-			    fclose(ef); }
-			ebuf[en] = '\0';
-			int wok = (wrc != 0)
-			    && (rows[i].experr == NULL
-			        || strstr(ebuf, rows[i].experr) != NULL);
-			if (!wok) {
-				fprintf(stderr, "row[%s]: wwstage expected "
-				    "builderr+'%s' (wrc=%d, stderr='%s')\n",
-				    rows[i].label,
-				    rows[i].experr ? rows[i].experr : "(any)",
-				    wrc, ebuf);
-				fail++;
-			}
-			unlink(errf);
-			unlink(src); rmdir(tmpdir);
-			continue;
-		}
-
-		snprintf(cmd, sizeof cmd, "cd %s && %s/ww build %s",
-		    tmpdir, bin, src);
-		if (runwait(cmd) != 0) {
-			fprintf(stderr, "row[%s]: cstage build failed\n",
-			    rows[i].label);
-			fail++;
-			unlink(src); rmdir(tmpdir);
-			continue;
-		}
-
-		char outbin[128];
-		const char *base = strrchr(src, '/');
-		base = base ? base + 1 : src;
-		snprintf(outbin, sizeof outbin, "%s/%s", tmpdir, base);
-		char *dot = strrchr(outbin, '.');
-		if (dot && strcmp(dot, ".ww") == 0) *dot = '\0';
-
-		int got = runwait(outbin);
-		if (got != rows[i].want_exit) {
-			fprintf(stderr, "row[%s]: cstage exit %d, want %d\n",
-			    rows[i].label, got, rows[i].want_exit);
-			fail++;
-		}
-		unlink(outbin); rmdir(tmpdir);
-
-		/* (b) cs==ww byte-id gate. */
-		char cs_s[64], ws_s[64];
-		snprintf(cs_s, sizeof cs_s, "/tmp/wwidx_%d_%d_cs.s",
-		    getpid(), i);
-		snprintf(ws_s, sizeof ws_s, "/tmp/wwidx_%d_%d_ww.s",
-		    getpid(), i);
-
-		snprintf(cmd, sizeof cmd, "%s -o %s %s 2>/dev/null",
-		    w6c, cs_s, src);
-		if (runwait(cmd) != 0) {
-			fprintf(stderr, "row[%s]: w6c failed\n", rows[i].label);
-			fail++; unlink(src); continue;
-		}
-		snprintf(cmd, sizeof cmd, "%s -o %s %s 2>/dev/null",
-		    w6c_ww, ws_s, src);
-		if (runwait(cmd) != 0) {
-			fprintf(stderr, "row[%s]: w6c_ww failed\n",
-			    rows[i].label);
-			fail++; unlink(src); unlink(cs_s); continue;
-		}
-		if (slurp_eq(cs_s, ws_s) != 0) {
-			fprintf(stderr,
-			    "row[%s]: cstage/wwstage .s DIFFER (rule-10 "
-			    "byte-id violation)\n", rows[i].label);
-			fail++;
-		}
-		unlink(src); unlink(cs_s); unlink(ws_s);
-	}
-
-	if (fail) {
-		fprintf(stderr, "%d/%d idxfield-compound tests failed\n",
-		    fail, n);
-		return 1;
-	}
-	printf("idxfield-compound: %d/%d ok (cstage run + cs==ww byte-id)\n",
-	    n, n);
-	return 0;
-}
diff --git a/test/wcc/data/dotfield_compound_float/case.ww b/test/wcc/data/dotfield_compound_float/case.ww
new file mode 100644
index 00000000..ec6ac20b
--- /dev/null
+++ b/test/wcc/data/dotfield_compound_float/case.ww
@@ -0,0 +1,14 @@
+//ww:error "single-dot field compound on float field"
+// Lifted from test/wcc/949_dotfield_compound_run.c reject row "dotfld_he_float"
+// (#34/rule-7): a compound assign on a single-dot FLOAT field is unwired in
+// both stages and MUST loud-fail, not silently demote to a plain store. The
+// substring is the shared diagnostic body — byte-identical on both stages,
+// pinned to "float field" so it cannot also match the str/slice/tagged rows
+// (no file:line, no cstage "ww: " prefix — both differ cs vs ww).
+package main;
+type S = struct { f: f64, g: int };
+export fn main() i32 = {
+	let s: S = S{f=1.0, g=0};
+	s.f *= 2.0;
+	return 0;
+};
diff --git a/test/wcc/data/dotfield_compound_slice/case.ww b/test/wcc/data/dotfield_compound_slice/case.ww
new file mode 100644
index 00000000..83c20396
--- /dev/null
+++ b/test/wcc/data/dotfield_compound_slice/case.ww
@@ -0,0 +1,15 @@
+//ww:error "single-dot field compound on slice field"
+// Lifted from test/wcc/949_dotfield_compound_run.c reject row "dotfld_he_slice"
+// (#34/rule-7): a compound assign on a single-dot SLICE field is unwired in
+// both stages and MUST loud-fail. The substring is the shared diagnostic body
+// — byte-identical on both stages, pinned to "slice field" so it cannot also
+// match the float/str/tagged rows (no file:line, no cstage "ww: " prefix —
+// both differ cs vs ww).
+package main;
+type S = struct { f: []u8, g: int };
+export fn main() i32 = {
+	let b: [2]u8 = [1u8, 2u8];
+	let s: S = S{f=b[0:2], g=0};
+	s.f += b[0:1];
+	return 0;
+};
diff --git a/test/wcc/data/dotfield_compound_str/case.ww b/test/wcc/data/dotfield_compound_str/case.ww
new file mode 100644
index 00000000..dd1e255e
--- /dev/null
+++ b/test/wcc/data/dotfield_compound_str/case.ww
@@ -0,0 +1,14 @@
+//ww:error "single-dot field compound on str field"
+// Lifted from test/wcc/949_dotfield_compound_run.c reject row "dotfld_he_str"
+// (#34/rule-7): a compound assign on a single-dot STR field is unwired in both
+// stages and MUST loud-fail. The substring is the shared diagnostic body —
+// byte-identical on both stages, pinned to "str field" so it cannot also match
+// the float/slice/tagged rows (no file:line, no cstage "ww: " prefix — both
+// differ cs vs ww).
+package main;
+type S = struct { f: str, g: int };
+export fn main() i32 = {
+	let s: S = S{f="a", g=0};
+	s.f += "x";
+	return 0;
+};
diff --git a/test/wcc/data/dotfield_compound_tagged/case.ww b/test/wcc/data/dotfield_compound_tagged/case.ww
new file mode 100644
index 00000000..a9fcfc2a
--- /dev/null
+++ b/test/wcc/data/dotfield_compound_tagged/case.ww
@@ -0,0 +1,14 @@
+//ww:error "single-dot field compound on tagged field"
+// Lifted from test/wcc/949_dotfield_compound_run.c reject row "dotfld_he_tagged"
+// (#34/rule-7): a compound assign on a single-dot TAGGED-union field is unwired
+// in both stages and MUST loud-fail. The substring is the shared diagnostic
+// body — byte-identical on both stages, pinned to "tagged field" so it cannot
+// also match the float/str/slice rows (no file:line, no cstage "ww: " prefix —
+// both differ cs vs ww).
+package main;
+type S = struct { f: (i32|str), g: int };
+export fn main() i32 = {
+	let s: S = S{f=1, g=0};
+	s.f += 3;
+	return 0;
+};
diff --git a/test/wcc/data/idxfield_compound_float/case.ww b/test/wcc/data/idxfield_compound_float/case.ww
new file mode 100644
index 00000000..f2ac8305
--- /dev/null
+++ b/test/wcc/data/idxfield_compound_float/case.ww
@@ -0,0 +1,14 @@
+//ww:error "arr[i].field compound on float field"
+// Lifted from test/wcc/949_idxfield_compound_run.c reject row "fld_he_float"
+// (#33/rule-7): a compound assign on an indexed-element FLOAT field is unwired
+// in both stages and MUST loud-fail, not silently fall through. The substring
+// is the shared diagnostic body — byte-identical on both stages, pinned to
+// "float field" so it cannot also match the str/slice/tagged rows (no
+// file:line, no cstage "ww: " prefix — both differ cs vs ww).
+package main;
+type S = struct { f: f64, g: i32 };
+export fn main() i32 = {
+	let xs: [2]S = [S{f=1.0, g=0}, S{f=0.0, g=0}];
+	xs[0].f /= 2.0;
+	return 0;
+};
diff --git a/test/wcc/data/idxfield_compound_slice/case.ww b/test/wcc/data/idxfield_compound_slice/case.ww
new file mode 100644
index 00000000..7654b61f
--- /dev/null
+++ b/test/wcc/data/idxfield_compound_slice/case.ww
@@ -0,0 +1,15 @@
+//ww:error "arr[i].field compound on slice field"
+// Lifted from test/wcc/949_idxfield_compound_run.c reject row "fld_he_slice"
+// (#33/rule-7): a compound assign on an indexed-element SLICE field is unwired
+// in both stages and MUST loud-fail. The substring is the shared diagnostic
+// body — byte-identical on both stages, pinned to "slice field" so it cannot
+// also match the float/str/tagged rows (no file:line, no cstage "ww: " prefix
+// — both differ cs vs ww).
+package main;
+type S = struct { f: []u8, g: i32 };
+export fn main() i32 = {
+	let b: [2]u8 = [1u8, 2u8];
+	let xs: [2]S = [S{f=b[0:2], g=0}, S{f=b[0:2], g=0}];
+	xs[0].f += b[0:1];
+	return 0;
+};
diff --git a/test/wcc/data/idxfield_compound_str/case.ww b/test/wcc/data/idxfield_compound_str/case.ww
new file mode 100644
index 00000000..edcfed34
--- /dev/null
+++ b/test/wcc/data/idxfield_compound_str/case.ww
@@ -0,0 +1,14 @@
+//ww:error "arr[i].field compound on str field"
+// Lifted from test/wcc/949_idxfield_compound_run.c reject row "fld_he_str"
+// (#33/rule-7): a compound assign on an indexed-element STR field is unwired in
+// both stages and MUST loud-fail. The substring is the shared diagnostic body
+// — byte-identical on both stages, pinned to "str field" so it cannot also
+// match the float/slice/tagged rows (no file:line, no cstage "ww: " prefix —
+// both differ cs vs ww).
+package main;
+type S = struct { f: str, g: i32 };
+export fn main() i32 = {
+	let xs: [2]S = [S{f="a", g=0}, S{f="b", g=0}];
+	xs[0].f += "x";
+	return 0;
+};
diff --git a/test/wcc/data/idxfield_compound_tagged/case.ww b/test/wcc/data/idxfield_compound_tagged/case.ww
new file mode 100644
index 00000000..deacb0b5
--- /dev/null
+++ b/test/wcc/data/idxfield_compound_tagged/case.ww
@@ -0,0 +1,14 @@
+//ww:error "arr[i].field compound on tagged field"
+// Lifted from test/wcc/949_idxfield_compound_run.c reject row "fld_he_tagged"
+// (#33/rule-7): a compound assign on an indexed-element TAGGED-union field is
+// unwired in both stages and MUST loud-fail. The substring is the shared
+// diagnostic body — byte-identical on both stages, pinned to "tagged field" so
+// it cannot also match the float/str/slice rows (no file:line, no cstage
+// "ww: " prefix — both differ cs vs ww).
+package main;
+type S = struct { f: (i32|str), g: i32 };
+export fn main() i32 = {
+	let xs: [2]S = [S{f=1, g=0}, S{f=2, g=0}];
+	xs[0].f += 3;
+	return 0;
+};