Test more cases in fixture grammar with inline rules

test/fixtures/test_grammars/inline_rules/corpus.txt

@@ -3,9 +3,18 @@ Expressions
 ==================================
 
 1 + 2 * 3;
+4 * 5 + 6;
+7 * (8 + 9);
 
 ---
 
-(statement (sum
-  (number)
-  (product (number) (number))))
+(program
+  (statement (sum
+    (number)
+    (product (number) (number))))
+  (statement (sum
+    (product (number) (number))
+    (number)))
+  (statement (product
+    (number)
+    (parenthesized_expression (sum (number) (number))))))

test/fixtures/test_grammars/inline_rules/grammar.json

@@ -10,6 +10,13 @@
   ],
 
   "rules": {
+    "program": {
+      "type": "REPEAT1",
+      "content": {
+        "type": "SYMBOL",
+        "name": "statement"
+      }
+    },
     "statement": {
       "type": "SEQ",
       "members": [