TASK: Ensure that StructType instances are considered equivalents of themselves

Author: grebaldi

src/TypeSystem/Type/StructType/StructType.php

@@ -40,6 +40,6 @@ public static function fromStructDeclarationNode(StructDeclarationNode $structDe
 
     public function is(TypeInterface $other): bool
     {
-        return false;
+        return $other === $this;
     }
 }

test/Unit/TypeSystem/Type/StructType/StructTypeTest.php

@@ -57,4 +57,20 @@ public function providesNameOfTheStruct(): void
 
         $this->assertEquals('SomeStruct', $structStaticType->structName);
     }
+
+    /**
+     * @test
+     * @return void
+     */
+    public function isEquivalentToItself(): void
+    {
+        $structDeclarationNode = StructDeclarationNode::fromString(
+            'struct SomeStruct {}'
+        );
+        $structStaticType = StructType::fromStructDeclarationNode(
+            $structDeclarationNode
+        );
+
+        $this->assertTrue($structStaticType->is($structStaticType));
+    }
 }