Use a better function name for closure related errors and debug_backtrace()

Zend/tests/closure_027.phpt

@@ -25,7 +25,7 @@ NULL
 
 Notice: Undefined variable: y in %s on line %d
 
-Warning: Missing argument 1 for (), called in %s on line %d and defined in %s on line %d
+Warning: Missing argument 1 for {closure}(), called in %s on line %d and defined in %s on line %d
 NULL
 
 Catchable fatal error: Argument 1 passed to test() must be an instance of Closure, instance of stdClass given, called in %s on line %d and defined in %s on line %d

Zend/tests/closure_032.phpt

@@ -0,0 +1,65 @@
+--TEST--
+Closure 032: Testing Closure and debug_backtrace
+--FILE--
+<?php
+
+function test(closure $a) {
+        $a(23);
+}
+
+
+$c = function($param) { print_r(debug_backtrace()); debug_print_backtrace(); };
+
+$c(23);
+test($c);
+?>
+--EXPECTF--
+Array
+(
+    [0] => Array
+        (
+            [file] => %s
+            [line] => %d
+            [function] => {closure}
+            [args] => Array
+                (
+                    [0] => 23
+                )
+
+        )
+
+)
+#0  {closure}(23) called at [%s:%d]
+Array
+(
+    [0] => Array
+        (
+            [file] => %s
+            [line] => %d
+            [function] => {closure}
+            [args] => Array
+                (
+                    [0] => 23
+                )
+
+        )
+
+    [1] => Array
+        (
+            [file] => %s
+            [line] => %d
+            [function] => test
+            [args] => Array
+                (
+                    [0] => Closure Object
+                        (
+                        )
+
+                )
+
+        )
+
+)
+#0  {closure}(23) called at [%s:%d]
+#1  test(Closure Object ()) called at [%s:%d]
+

Zend/zend_compile.c

@@ -1460,7 +1460,7 @@ void zend_do_begin_lambda_function_declaration(znode *result, znode *function_to
 	zend_op       *current_op;
 
 	function_name.op_type = IS_CONST;
-	ZVAL_ASCII_STRING(&function_name.u.constant, "", ZSTR_DUPLICATE);
+	ZVAL_ASCII_STRING(&function_name.u.constant, "{closure}", ZSTR_DUPLICATE);
 
 	zend_do_begin_function_declaration(function_token, &function_name, 0, return_reference, NULL TSRMLS_CC);
 
@@ -1475,7 +1475,7 @@ void zend_do_begin_lambda_function_declaration(znode *result, znode *function_to
 	if (is_static) {
 	    CG(active_op_array)->fn_flags |= ZEND_ACC_STATIC;
 	}
-    CG(active_op_array)->fn_flags |= ZEND_ACC_CLOSURE;
+	CG(active_op_array)->fn_flags |= ZEND_ACC_CLOSURE;
 }
 /* }}} */