feat: implement macro argument prescan

cf. https://gcc.gnu.org/onlinedocs/cpp/Argument-Prescan.html

1 files changed, 16 insertions, 0 deletions

diff --git a/tests/test_macro_operators.sh b/tests/test_macro_operators.sh
index daf8f47..a77d3ca 100644
--- a/tests/test_macro_operators.sh
+++ b/tests/test_macro_operators.sh
@@ -41,3 +41,19 @@ int main() {
 }
 EOF
 
+cat <<'EOF' > expected
+123
+EOF
+test_diff <<'EOF'
+int printf(const char*, ...);
+
+#define F(x) CHECK(G(x))
+#define G(x) CHECK(H(x))
+#define CHECK(x) x
+
+int H(int n) { return n; }
+
+int main() {
+    printf("%d\n", F(123));
+}
+EOF