lexer: Putback non-identifier token

Signed-off-by: Ian Moffett <ian@mirocom.org>

core/lexer.c

@@ -142,6 +142,7 @@ lexer_scan_ident(struct rifle_state *state, int lc, struct token *tok)
         }
 
         if (!isalnum(c) && c != '.' && c != '_') {
+            lexer_putback(state, c);
             buf[bufsz] = '\0';
             break;
         }