diff --git a/src/glue.h b/src/glue.h
index 1fe6ce46f453e911339e5ea3090e2436283f106a..6c1c56ca0e368bc407d846f342dd52ba934c9dda 100644
--- a/src/glue.h
+++ b/src/glue.h
@@ -11,7 +11,8 @@
 //
 // A few standard semantic actions are defined below. The H_ACT_APPLY macro
 // allows semantic actions to be defined by "partial application" of
-// a generic action to fixed paramters.
+// a generic action to fixed paramters. H_VALIDATE_APPLY is similar for
+// h_atter_bool.
 //
 // The definition of more complex semantic actions will usually consist of
 // extracting data from the given parse tree and constructing a token of custom
@@ -66,13 +67,13 @@
     h_attr_bool(h_action(def, act_ ## rule, NULL), validate_ ## rule, NULL)
 #define H_AVRULE(rule, def) HParser *rule = \
     h_action(h_attr_bool(def, validate_ ## rule, NULL), act_ ## rule, NULL)
-#define H_ADRULE(rule, def, data) HParser *rule =	\
+#define H_ADRULE(rule, def, data) HParser *rule =       \
     h_action(def, act_ ## rule, data)
-#define H_VDRULE(rule, def, data) HParser *rule =	\
+#define H_VDRULE(rule, def, data) HParser *rule =       \
     h_attr_bool(def, validate_ ## rule, data)
-#define H_VADRULE(rule, def, data) HParser *rule =		\
+#define H_VADRULE(rule, def, data) HParser *rule =              \
     h_attr_bool(h_action(def, act_ ## rule, data), validate_ ## rule, data)
-#define H_AVDRULE(rule, def, data) HParser *rule =		\
+#define H_AVDRULE(rule, def, data) HParser *rule =              \
     h_action(h_attr_bool(def, validate_ ## rule, data), act_ ## rule, data)
 
 
@@ -109,8 +110,14 @@ HParsedToken *h_act_ignore(const HParseResult *p, void* user_data);
 // Define 'myaction' as a specialization of 'paction' by supplying the leading
 // parameters.
 #define H_ACT_APPLY(myaction, paction, ...) \
-  HParsedToken *myaction(const HParseResult *p, void* user_data) {	\
-    return paction(__VA_ARGS__, p, user_data);				\
+  HParsedToken *myaction(const HParseResult *p, void* user_data) {      \
+    return paction(__VA_ARGS__, p, user_data);                          \
+  }
+
+// Similar, but for validations.
+#define H_VALIDATE_APPLY(myvalidation, pvalidation, ...)  \
+  bool myvalidation(HParseResult* p, void* user_data) {   \
+    return pvalidation(__VA_ARGS__, p, user_data);        \
   }