Support mocking methods with a "static" return type

spec/Prophecy/Prophecy/MethodProphecySpec.php

@@ -567,6 +567,33 @@ function it_returns_object_prophecy_for_object_return_type(ObjectProphecy $objec
         $return->shouldImplement(ProphecySubjectInterface::class);
     }
 
+    function it_returns_double_for_static_return_type(ObjectProphecy $objectProphecy, ArgumentsWildcard $argumentsWildcard)
+    {
+        if (\PHP_VERSION_ID < 80000) {
+            return;
+        }
+
+        $objectProphecy->reveal()->willReturn(
+            eval(
+            <<<CODE
+class ClassNameWithStaticReturnMethod {
+    public function foo() : static
+    {
+    }
+}
+
+return new ClassNameWithStaticReturnMethod();
+CODE
+            )
+        );
+        $objectProphecy->addMethodProphecy(Argument::any())->willReturn();
+
+        $this->beConstructedWith($objectProphecy, 'foo', $argumentsWildcard);
+
+        $return = $this->getPromise()->execute([], $objectProphecy, $this);
+        $return->shouldImplement(ProphecySubjectInterface::class);
+    }
+
     function it_throws_for_non_existent_class_return_type(ObjectProphecy $objectProphecy, ArgumentsWildcard $argumentsWildcard)
     {
         $this->generateMethodProphecyWithReturnValue($objectProphecy, 'foo', 'NonExistentClass');

src/Prophecy/Prophecy/MethodProphecy.php

@@ -155,6 +155,10 @@ static function(string $type1, string $type2) {
                 $this->voidReturnType = true;
             }
 
+            if ('static' === $defaultType) {
+                $defaultType = get_class($double);
+            }
+
             $this->will(function ($args, ObjectProphecy $object, MethodProphecy $method) use ($defaultType) {
                 switch ($defaultType) {
                     case 'void': return;