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wcc/ww: reject (a,) single-element trailing-comma tuple (catB-92)

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wwstage's tuple-parse loop checked the RPAREN-break at the top, so
`(a,)` parsed as a 1-element N_TUPLE and reached cgen — a silent
wrong-accept. A trailing comma is legal only after >=2 elements.
Align the loop order to cstage cmd/wcc/parse.c:552-558 (parse each
element before the RPAREN-break); `(a,)` now errors at the next
parseexpr, `(a, b)` / `(a, b,)` are unchanged. cstage already
rejected; this brings wwstage's w6c_ww parser into agreement.

Regen w6c/wwdump combined.ww (parser embeds in both). Valid-program
codegen unchanged → cs==ww byte-id gate stays green.
This commit is contained in:
Hojun-Cho
2026-06-15 03:49:38 +09:00
parent a8b43b8f4b
commit 6b7de54272
5 changed files with 208 additions and 3 deletions
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7
Makefile
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@@ -247,6 +247,7 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
$(BIN)/test_arr_strslice_elem \
$(BIN)/test_arr_tagged_elem \
$(BIN)/test_dup_main_reject \
$(BIN)/test_tuple_trailing_comma_reject \
$(BIN)/test_size_untyped_int \
$(BIN)/test_tagged_staticinit \
$(BIN)/test_arr_infer_len \
@@ -1449,6 +1450,12 @@ $(BIN)/test_dup_main_reject: test/wcc/842_dup_main_reject.c $(BIN)/ww \
$(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_tuple_trailing_comma_reject: test/wcc/845_tuple_trailing_comma_reject.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_tagged_staticinit: test/wcc/843_tagged_staticinit.c $(BIN)/ww \
$(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
$(BIN)/ww_ww $(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww \