Fix parsing order of nested PtrDecls

Closes #68
diff --git a/utils/internal/constptr.c b/utils/internal/constptr.c
new file mode 100644
index 0000000..2fe14bf
--- /dev/null
+++ b/utils/internal/constptr.c
@@ -0,0 +1,9 @@
+void foo(char * const * arg) {
+  arg += 1;
+  (*arg) += 1;
+}
+
+void foo2(char ** const arg) {
+  arg += 1;
+  (*arg) += 1;
+}