fix: handle class name collision while parsing types inside a class

src/Type/Parser/Lexer/AliasLexer.php

@@ -31,7 +31,9 @@ public function tokenize(string $symbol): Token
 
     private function resolve(string $symbol): string
     {
-        if (Reflection::classOrInterfaceExists($symbol)) {
+        // Matches the case where a class extends a class with the same name but
+        // in a different namespace.
+        if ($symbol === $this->reflection->getShortName() && Reflection::classOrInterfaceExists($symbol)) {
             return $symbol;
         }
 

tests/Integration/Mapping/ClassNameCollisionTestCollision.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace CuyZ\Valinor\Tests\Integration\Mapping;
+
+use CuyZ\Valinor\Mapper\MappingError;
+use CuyZ\Valinor\MapperBuilder;
+use CuyZ\Valinor\Tests\Integration\IntegrationTest;
+use CuyZ\Valinor\Tests\Integration\Mapping\Fixture\Error;
+
+final class ClassNameCollisionTestCollision extends IntegrationTest
+{
+    public function test_mapping_to_class_with_same_class_name_as_native_class_works_properly(): void
+    {
+        try {
+            $result = (new MapperBuilder())
+                ->mapper()
+                ->map(ObjectWithErrorsClassNameCollision::class, ['foo', 'bar']);
+        } catch (MappingError $error) {
+            $this->mappingFail($error);
+        }
+
+        self::assertSame('foo', $result->errors[0]->message);
+        self::assertSame('bar', $result->errors[1]->message);
+    }
+}
+
+final class ObjectWithErrorsClassNameCollision
+{
+    public function __construct(
+        /** @var list<Error> */
+        public array $errors
+    ) {}
+}

tests/Integration/Mapping/Fixture/Error.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace CuyZ\Valinor\Tests\Integration\Mapping\Fixture;
+
+/**
+ * Has the same name of the native class `Error` on purpose.
+ */
+final class Error
+{
+    public function __construct(
+        public string $message
+    ) {}
+}