grammars/source.c.json in github-linguist-4.8.17 vs grammars/source.c.json in github-linguist-4.8.18

@@ -712,9 +712,13 @@
     "string_placeholder": {
       "patterns": [
         {
           "match": "(?x)%\n    \t\t\t\t\t\t(\\d+\\$)?                             # field (argument #)\n    \t\t\t\t\t\t[#0\\- +']*                           # flags\n    \t\t\t\t\t\t[,;:_]?                              # separator character (AltiVec)\n    \t\t\t\t\t\t((-?\\d+)|\\*(-?\\d+\\$)?)?              # minimum field width\n    \t\t\t\t\t\t(\\.((-?\\d+)|\\*(-?\\d+\\$)?)?)?         # precision\n    \t\t\t\t\t\t(hh|h|ll|l|j|t|z|q|L|vh|vl|v|hv|hl)? # length modifier\n    \t\t\t\t\t\t[diouxXDOUeEfFgGaACcSspn%]           # conversion type\n    \t\t\t\t\t",
           "name": "constant.other.placeholder.c"
+        },
+        {
+          "match": "%",
+          "name": "invalid.illegal.placeholder.c"
         }
       ]
     }
   },
   "scopeName": "source.c",
\ No newline at end of file