--- c-grammar.scm.orig	2019-10-04 00:07:42.000000000 +0900
+++ c-grammar.scm	2019-10-03 22:17:39.000000000 +0900
@@ -19,7 +19,7 @@
   XOR_ASSIGN OR_ASSIGN TYPENAME

   TYPEDEF EXTERN STATIC AUTO REGISTER INLINE RESTRICT
-  SIGNED UNSIGNED CONST VOLATILE
+  SIGNED UNSIGNED CONST VOLATILE NULLABLE NONNULL
   STRUCT UNION ENUM ELLIPSIS RANGE

   CASE DEFAULT IF ELSE SWITCH WHILE DO FOR GOTO CONTINUE BREAK RETURN
@@ -113,6 +113,8 @@
   (RESTRICT) : '()
   (TYPENAME objc_non_empty_protocol_references) : (%TYPENAME $1)
   (objc_non_empty_protocol_references) : '(id)
+  (NULLABLE) : '()
+  (NONNULL) : '()
   )

  (primary_expr
@@ -549,6 +551,8 @@
   (CONST)
   (VOLATILE)
   (RESTRICT)
+  (NULLABLE)
+  (NONNULL)
   )

  (array_qualifier
@@ -556,6 +560,8 @@
   (RESTRICT)
   (CONST)
   (VOLATILE)
+  (NULLABLE)
+  (NONNULL)
   )

  (array_qualifier_list