Consider the negation operator (!) to be a word even if it is not followed

by whitespace.  This allows "optional !foo" which is what most programmers
are naturally going to tend to do as opposed to "optional ! foo".

usr.sbin/config/main.c

@@ -314,6 +314,11 @@ begin:
 	}
 	cp = line;
 	*cp++ = ch;
+	/* Negation operator is a word by itself. */
+	if (ch == '!') {
+		*cp = 0;
+		return (line);
+	}
 	while ((ch = getc(fp)) != EOF) {
 		if (isspace(ch))
 			break;