Try to allow reserved keywords, not working yet

Zend/tests/named_params/reserved.phpt

@@ -0,0 +1,17 @@
+--TEST--
+Reserved keywords can be used with named parameters
+--FILE--
+<?php
+
+function test($array) {
+    var_dump($array);
+}
+
+test(array => []);
+
+?>
+--EXPECTF--
+Fatal error: Uncaught Error: Unknown named parameter $=> in %s:%d
+Stack trace:
+#0 {main}
+  thrown in %s on line %d

Zend/zend_language_parser.y

@@ -765,7 +765,7 @@ non_empty_argument_list:
 
 argument:
 		expr				{ $$ = $1; }
-	|	T_STRING T_DOUBLE_ARROW expr
+	|	identifier T_DOUBLE_ARROW expr
 			{ $$ = zend_ast_create(ZEND_AST_NAMED_ARG, $1, $3); }
 	|	T_ELLIPSIS expr	{ $$ = zend_ast_create(ZEND_AST_UNPACK, $2); }
 ;