From f2fc8861fe241683ccc4bf026fbeeefe6ba1e04e Mon Sep 17 00:00:00 2001
From: Kimplul <kimi.h.kuparinen@gmail.com>
Date: Wed, 23 Jul 2025 18:35:18 +0300
Subject: check const types with static_assert

---
 src/main.c           | 29 ++++++++++++++++++-----------
 tests/Makefile       |  2 ++
 tests/xfail/Makefile | 15 +++++++++++++++
 tests/xfail/val.c    | 18 ++++++++++++++++++
 4 files changed, 53 insertions(+), 11 deletions(-)
 create mode 100644 tests/xfail/Makefile
 create mode 100644 tests/xfail/val.c

diff --git a/src/main.c b/src/main.c
index e801130..917a68c 100644
--- a/src/main.c
+++ b/src/main.c
@@ -723,10 +723,12 @@ static void expand_instance(char *id, char *instance)
 
 	if (tokens_len(&type_params) != tokens_len(&type_args)) {
 		fprintf(stderr, "mismatch type params vs args\n");
-		drop_tokens(&type_traits);
-		drop_tokens(&type_params);
-		drop_tokens(&type_args);
-		goto cleanup;
+		abort();
+	}
+
+	if (tokens_len(&type_traits) != tokens_len(&type_args)) {
+		fprintf(stderr, "mismatch type traits vs args\n");
+		abort();
 	}
 
 	for (size_t i = 0; i < tokens_len(&type_params); ++i) {
@@ -754,20 +756,25 @@ static void expand_instance(char *id, char *instance)
 
 	if (tokens_len(&const_params) != tokens_len(&const_args)) {
 		fprintf(stderr, "mismatch const params vs args\n");
-		drop_tokens(&const_types);
-		drop_tokens(&const_params);
-		drop_tokens(&const_args);
-		goto cleanup;
+		abort();
+	}
+
+	if (tokens_len(&const_types) != tokens_len(&const_args)) {
+		fprintf(stderr, "mismatch const types vs args\n");
+		abort();
 	}
 
 	for (size_t i = 0; i < tokens_len(&const_params); ++i) {
+		char *type = *tokens_at(&const_types,  i);
 		char *name = *tokens_at(&const_params, i);
-		char *type = *tokens_at(&const_args,   i);
+		char *arg  = *tokens_at(&const_args,   i);
 
-		body  = replace_id(body, name, type);
+		printf("_Static_assert(_Generic((%s), %s: 1, default: 0));\n", arg, type);
+
+		body  = replace_id(body, name, arg);
 
 		if (super)
-			super = replace_id(super, name, type);
+			super = replace_id(super, name, arg);
 	}
 
 	if (super)
diff --git a/tests/Makefile b/tests/Makefile
index bcc91d3..1041e61 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -1,5 +1,7 @@
 all:
 	$(MAKE) -C xok
+	$(MAKE) -C xfail
 
 clean:
 	$(MAKE) -C xok clean
+	$(MAKE) -C xfail clean
diff --git a/tests/xfail/Makefile b/tests/xfail/Makefile
new file mode 100644
index 0000000..b38feae
--- /dev/null
+++ b/tests/xfail/Makefile
@@ -0,0 +1,15 @@
+FILES	!= echo *.c
+TARGETS	:= $(FILES:%.c=build/%)
+
+all: $(TARGETS)
+
+build/%: %.c ../../ngc1
+	@mkdir -p build
+	@gcc -E $< -o $@.i
+	@(../../ngc1 $@.i > $@.c 2>/dev/null && gcc $@.c -o $@ 2>/dev/null) \
+		&& echo "FAIL  $@" \
+		|| echo "XFAIL $@"
+
+.PHONY: clean
+clean:
+	$(RM) -rf build
diff --git a/tests/xfail/val.c b/tests/xfail/val.c
new file mode 100644
index 0000000..d231a4a
--- /dev/null
+++ b/tests/xfail/val.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+typedef tmpl[](int v){
+	int <>_ok()
+	{
+		return v;
+	}
+};
+
+/* float vs int, should fail */
+typedef inst = tmpl[](20.0);
+
+int main()
+{
+	int ok = inst_ok();
+	if (ok == 20)
+		puts("OK");
+}
-- 
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