Add test for conditional function declaration

Author: igorw

Zend/tests/use_function/conditional_function_declaration.phpt

@@ -0,0 +1,17 @@
+--TEST--
+function that is conditionally defined at runtime should not cause compiler error
+--FILE--
+<?php
+
+if (0) {
+    function foo() {
+    }
+}
+
+use function bar\foo;
+
+echo "Done";
+
+?>
+--EXPECT--
+Done