change E_NOTICE to E_ERROR when using a class constant from non-existent class

(noticed by Jani)
add tests

Zend/tests/class_constants_001.phpt

@@ -0,0 +1,27 @@
+--TEST--
+class constants basic tests
+--FILE--
+<?php
+
+class test {
+	const val = "string";
+	const val2 = 1;
+}
+
+var_dump(test::val);
+var_dump(test::val2);
+
+var_dump(test::val3);
+
+echo "Done\n";
+?>
+--EXPECTF--	
+string(6) "string"
+int(1)
+
+Fatal error: Undefined class constant 'val3' in %s on line %d
+--UEXPECTF--
+unicode(6) "string"
+int(1)
+
+Fatal error: Undefined class constant 'val3' in %s on line %d

Zend/tests/class_constants_002.phpt

@@ -0,0 +1,31 @@
+--TEST--
+class constants as default function arguments
+--FILE--
+<?php
+
+class test {
+	const val = 1;
+}
+
+function foo($v = test::val) {
+	var_dump($v);
+}
+
+function bar($b = NoSuchClass::val) {
+	var_dump($b);
+}
+
+foo();
+foo(5);
+
+bar(10);
+bar();
+
+echo "Done\n";
+?>
+--EXPECTF--	
+int(1)
+int(5)
+int(10)
+
+Fatal error: Class 'NoSuchClass' not found in %s on line %d

Zend/tests/class_constants_003.phpt

@@ -0,0 +1,33 @@
+--TEST--
+class constants as default function arguments and dynamically loaded classes
+--FILE--
+<?php
+
+$class_data = <<<DATA
+<?php
+class test {
+	const val = 1;
+}
+?>
+DATA;
+
+$filename = dirname(__FILE__)."/cc003.dat";
+file_put_contents($filename, $class_data);
+
+function foo($v = test::val) {
+	var_dump($v);
+}
+
+include $filename;
+
+foo();
+foo(5);
+
+unlink($filename);
+
+echo "Done\n";
+?>
+--EXPECTF--	
+int(1)
+int(5)
+Done

Zend/zend_constants.c

@@ -318,15 +318,16 @@ ZEND_API int zend_u_get_constant(zend_uchar type, zstr name, uint name_len, zval
 				retval = 0;
 			}
 		}
-		efree(class_name.v);
 
 		if (retval && ce) {
 			if (zend_u_hash_find(&((*ce)->constants_table), type, constant_name, const_name_len+1, (void **) &ret_constant) != SUCCESS) {
 				retval = 0;
 			}
 		} else {
+			zend_error(E_ERROR, "Class '%R' not found", type, class_name);
 			retval = 0;
 		}
+		efree(class_name.v);
 
 		if (retval) {
 			zval_update_constant(ret_constant, (void*)1 TSRMLS_CC);