         ]
       }
     ]
-  actions:
-    patterns: [
-      {
+
+  rule_actions:
+    patterns: [
+      {
+        name: "meta.action.jison"
         begin: "\\{"
+        end:   "\\}"
+        beginCaptures: 0: name: "punctuation.definition.action.begin.jison"
+        endCaptures:   0: name: "punctuation.definition.action.end.jison"
+        patterns: [include: "source.js"]
+      }
+      {
+        name:  "meta.action.jison"
+        begin: "->"
+        end:   "((//).*)?(?=$)"
         beginCaptures:
-          0:
-            name: "punctuation.action.begin.jison"
-        end: "\\}"
-        endCaptures:
-          0:
-            name: "punctuation.action.end.jison"
-        name: "meta.action.jison"
-        comment: "Match action blocks associated with grammar rules"
-        patterns: [
-          # TODO: Patterns for $-variable go here, or inside block_innards
-          {
-            include: "source.js"
-          }
-          {
-            match: "\\$[$a-zA-Z\_][$a-zA-Z0-9\_]*",
-            name: "variable.interpolation.grammar-rule.jison",
-            comment: "A grammar rule variable reference."
-          }
-        ]
-      }
-    ]
+          0: name: "punctuation.definition.action.arrow.jison"
+        endCaptures:
+          1: name: "comment.line.double-slash.js"
+          2: name: "punctuation.definition.comment.js"
+        # TODO: The end pattern is based on the comment.line.double-slash.js
+        # pattern in
+        # https://github.com/atom/language-javascript/blob/master/grammars/javascript.cson.
+        # The end pattern of comment.line.double-slash.js is itself $, so $
+        # can’t be the end pattern here because it will never be matched. Is
+        # there an end pattern that can be used here that doesn’t duplicate a
+        # JavaScript grammar pattern?
+        patterns: [include: "source.js"]
+      }
+    ]
+
   comments:
     patterns: [
       {

        ]
      }
    ]

            include: "#symbols"
          }
          {
            include: "#rule_actions"
          }
        ]
      }
