c: fix some compatible type declarations

When K&R prototypes are present, definition of compatible types and
composite types becomes recursive. For example

`int f(int (*)())`
should be compatible with
`int f(int (*)(int))`

etc

1 files changed, 13 insertions, 0 deletions

diff --git a/test/22-decl.c b/test/22-decl.c
new file mode 100644
index 0000000..ddb1a57
--- /dev/null
+++ b/test/22-decl.c
@@ -0,0 +1,13 @@
+/* EXPECT:
+*/
+
+void f(int (*)());
+void f(int (*)(int));
+void f(int (*)());
+int a[];
+int a[100];
+int a[];
+
+int main() {
+}
+