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wcc/ww: reject reassignment of a const binding (catB-22)

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The sym carried an is_const flag (lib/ww/sym.ww) but wwstage never
set it at the let-install nor consumed it at assignment, so mutating
a `const` slipped through silently. Mirror cstage's two sites: set
is_const when n.op == TK_CONST at the local let-install (cmd/wcc/
check.c:2408) and reject an N_ASSIGN whose lhs ident resolves to an
is_const sym (cmd/wcc/check.c:1889-1896). cstage already rejected;
this aligns wwstage's w6c_ww UP. A bare `_` discard lvalue (empty
str) is skipped.

Regen w6c/wwdump combined.ww (checker embeds in both). Valid-program
codegen unchanged → cs==ww byte-id gate stays green.
This commit is contained in:
Hojun-Cho
2026-06-15 03:55:46 +09:00
parent d0adfe5aab
commit 5ae3787cb9
5 changed files with 249 additions and 3 deletions
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7
Makefile
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@@ -249,6 +249,7 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
$(BIN)/test_dup_main_reject \
$(BIN)/test_tuple_trailing_comma_reject \
$(BIN)/test_voidless_return_reject \
$(BIN)/test_const_reassign_reject \
$(BIN)/test_size_untyped_int \
$(BIN)/test_tagged_staticinit \
$(BIN)/test_arr_infer_len \
@@ -1463,6 +1464,12 @@ $(BIN)/test_voidless_return_reject: test/wcc/846_voidless_return_reject.c $(BIN)
$(LIB)/libwwrt.a | $(BIN)
$(CC) $(CFLAGS) -o $@ $<
$(BIN)/test_const_reassign_reject: test/wcc/847_const_reassign_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 \