Parser

- Plain arguments may only be upgraded to search patterns if they cannot be
  split into multiple lexemes, and do not canonicalize to an attribute name.

src/Parser.cpp

@@ -1439,8 +1439,11 @@ void Parser::findPlainArgs ()
       std::string raw = (*i)->attribute ("raw");
       std::vector <std::string> lexed;
       Lexer::token_split (lexed, raw);
-
       if (lexed.size () == 1)
+      {
+        // Furthermore, the word must not canonicalize to an attribute name.
+        std::string canonical;
+        if (! canonicalize (canonical, "attribute", raw))
         {
           // This tag also prevents further expanѕion.
           (*i)->tag ("PATTERN");
@@ -1459,6 +1462,7 @@ void Parser::findPlainArgs ()
       }
     }
   }
+}
 
 ////////////////////////////////////////////////////////////////////////////////
 void Parser::findMissingOperators ()