Verify ? placeholder also works in new

Author: thekid

src/test/php/lang/ast/unittest/emit/CallableSyntaxTest.class.php

@@ -160,7 +160,7 @@ public function run() {
   }
 
   #[Test]
-  public function instantiation() {
+  public function instantiation_variadic() {
     $f= $this->run('use lang\ast\unittest\emit\Handle; class %T {
       public function run() {
         return new Handle(...);
@@ -169,6 +169,16 @@ public function run() {
     Assert::equals(new Handle(1), $f(1));
   }
 
+  #[Test]
+  public function instantiation_argument() {
+    $f= $this->run('use lang\ast\unittest\emit\Handle; class %T {
+      public function run() {
+        return new Handle(?);
+      }
+    }');
+    Assert::equals(new Handle(1), $f(1));
+  }
+
   #[Test]
   public function instantiation_in_map() {
     $r= $this->run('use lang\ast\unittest\emit\Handle; class %T {