diff.diff

diff --git a/Zend/zend_language_parser.y b/Zend/zend_language_parser.y
index 43cf22b..e6af8de 100644
--- a/Zend/zend_language_parser.y
+++ b/Zend/zend_language_parser.y
@@ -253,6 +253,7 @@ static YYSIZE_T zend_yytnamerr(char*, const char*);
 %type <ast> array_pair non_empty_array_pair_list array_pair_list possible_array_pair
 %type <ast> isset_variable type return_type type_expr
 %type <ast> identifier
+%type <ast> function_identifier
 
 %type <num> returns_ref function is_reference is_variadic variable_modifiers
 %type <num> method_modifiers non_empty_member_modifiers member_modifier
@@ -1264,6 +1265,13 @@ internal_functions_in_yacc:
                        { $$ = zend_ast_create_ex(ZEND_AST_INCLUDE_OR_EVAL, ZEND_REQUIRE, $2); }
        |       T_REQUIRE_ONCE expr
                        { $$ = zend_ast_create_ex(ZEND_AST_INCLUDE_OR_EVAL, ZEND_REQUIRE_ONCE, $2); }
+       |       T_CALLABLE '(' function_identifier ')' { $$ = $3; }
+;
+
+function_identifier:
+               dereferencable T_OBJECT_OPERATOR identifier     { $$ = NULL; }
+       |       class_name T_PAAMAYIM_NEKUDOTAYIM identifier    { $$ = NULL; }
+       |       name                                            { $$ = NULL; }
 ;
 
 isset_variables: