fix: hanging parser on trailing comment

src/grammar.json

@@ -5,17 +5,8 @@
       "type": "CHOICE",
       "members": [
         {
-          "type": "CHOICE",
-          "members": [
-            {
-              "type": "SYMBOL",
-              "name": "body"
-            },
-            {
-              "type": "SYMBOL",
-              "name": "object"
-            }
-          ]
+          "type": "SYMBOL",
+          "name": "body"
         },
         {
           "type": "BLANK"

src/node-types.json

@@ -202,10 +202,6 @@
         {
           "type": "body",
           "named": true
-        },
-        {
-          "type": "object",
-          "named": true
         }
       ]
     }

src/scanner.cc

@@ -283,6 +283,9 @@ private:
     skip(lexer);
     while (lexer->lookahead != '\n') {
       skip(lexer);
+      if (lexer->eof(lexer)) {
+        return false;
+      }
     }
     return true;
   }