issue #35 enhance the lua_variable_symbol structure to hold a referen…

…ce to the _ENV symbol

src/parser.c

@@ -397,6 +397,9 @@ static struct ast_node *new_symbol_reference(struct parser_state *parser, const
 		// resolved by _ENV[name] - we leave that to the code generator to decide.
 		// However adding an upvalue later is hard so we do it here.
 		add_upvalue_for_ENV(parser);
+		bool is_local;
+		global->variable.env = search_for_variable(parser, parser->container->_ENV, &is_local);
+		assert(global->variable.env);
 	}
 	struct ast_node *symbol_expr = allocate_expr_ast_node(parser, EXPR_SYMBOL);
 	symbol_expr->symbol_expr.type = symbol->variable.value_type;

src/parser.h

@@ -124,6 +124,7 @@ struct lua_variable_symbol {
 	struct var_type value_type;
 	const struct string_object *var_name; /* name of the variable */
 	struct block_scope *block; /* NULL if global symbol, as globals are never added to a scope */
+	struct lua_symbol *env; /* Only applicable for global symbols - this should point to _ENV */
 	unsigned escaped: 1, /* Has one or more up-value references */
 		function_parameter: 1; /* Is a function parameter */
 	struct pseudo *pseudo;	   /* backend data for the symbol */