+static void parser_enterblock(parser_t *parser)
+{
+ vec_push(parser->variables, util_htnew(PARSER_HT_SIZE));
+ vec_push(parser->_blocklocals, vec_size(parser->_locals));
+}
+
+static bool parser_leaveblock(parser_t *parser)
+{
+ bool rv = true;
+ size_t locals;
+
+ if (vec_size(parser->variables) <= PARSER_HT_LOCALS) {
+ parseerror(parser, "internal error: parser_leaveblock with no block");
+ return false;
+ }
+
+ util_htdel(vec_last(parser->variables));
+ vec_pop(parser->variables);
+ if (!vec_size(parser->_blocklocals)) {
+ parseerror(parser, "internal error: parser_leaveblock with no block (2)");
+ return false;
+ }
+
+ locals = vec_last(parser->_blocklocals);
+ vec_pop(parser->_blocklocals);
+ while (vec_size(parser->_locals) != locals) {
+ ast_expression *e = vec_last(parser->_locals);
+ ast_value *v = (ast_value*)e;
+ vec_pop(parser->_locals);
+ if (ast_istype(e, ast_value) && !v->uses) {
+ if (parsewarning(parser, WARN_UNUSED_VARIABLE, "unused variable: `%s`", v->name))
+ rv = false;
+ }
+ }
+
+ return rv;
+}
+
+static void parser_addlocal(parser_t *parser, const char *name, ast_expression *e)
+{
+ vec_push(parser->_locals, e);
+ util_htset(vec_last(parser->variables), name, (void*)e);
+}
+