Scope->rememberConstructorScope should not remember the function scope

src/Analyser/MutatingScope.php

@@ -348,7 +348,7 @@ public function rememberConstructorScope(): self
 		return $this->scopeFactory->create(
 			$this->context,
 			$this->isDeclareStrictTypes(),
-			$this->getFunction(),
+			null,
 			$this->getNamespace(),
 			$this->rememberConstructorExpressions($this->expressionTypes),
 			$this->rememberConstructorExpressions($this->nativeExpressionTypes),

tests/PHPStan/Analyser/InstanceMethodsParameterScopeFunctionRule.php

@@ -0,0 +1,34 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Analyser;
+
+use PhpParser\Node;
+use PhpParser\Node\Name\FullyQualified;
+use PHPStan\Rules\Rule;
+use PHPStan\Rules\RuleErrorBuilder;
+use PHPStan\ShouldNotHappenException;
+use function sprintf;
+
+/**
+ * @implements Rule<FullyQualified>
+ */
+class InstanceMethodsParameterScopeFunctionRule implements Rule
+{
+
+	public function getNodeType(): string
+	{
+		return FullyQualified::class;
+	}
+
+	public function processNode(Node $node, Scope $scope): array
+	{
+		if ($scope->getFunction() !== null) {
+			throw new ShouldNotHappenException('All names in the tests should not have a function scope.');
+		}
+
+		return [
+			RuleErrorBuilder::message(sprintf('Name %s found in function scope null', $node->toString()))->identifier('test.instanceOfMethodsParameterRule')->build(),
+		];
+	}
+
+}

tests/PHPStan/Analyser/InstanceMethodsParameterScopeFunctionTest.php

@@ -0,0 +1,43 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Analyser;
+
+use PHPStan\Rules\Rule;
+use PHPStan\Testing\RuleTestCase;
+use const PHP_VERSION_ID;
+
+/**
+ * @extends RuleTestCase<InstanceMethodsParameterScopeFunctionRule>
+ */
+class InstanceMethodsParameterScopeFunctionTest extends RuleTestCase
+{
+
+	protected function getRule(): Rule
+	{
+		return new InstanceMethodsParameterScopeFunctionRule();
+	}
+
+	protected function shouldNarrowMethodScopeFromConstructor(): bool
+	{
+		return true;
+	}
+
+	public function testRule(): void
+	{
+		if (PHP_VERSION_ID < 80000) {
+			$this->markTestSkipped('Test requires PHP 8.0.');
+		}
+
+		$this->analyse([__DIR__ . '/data/instance-methods-parameter-scope.php'], [
+			[
+				'Name DateTime found in function scope null',
+				12,
+			],
+			[
+				'Name Baz\Waldo found in function scope null',
+				16,
+			],
+		]);
+	}
+
+}

tests/PHPStan/Analyser/data/instance-methods-parameter-scope.php

@@ -0,0 +1,19 @@
+<?php
+declare(strict_types = 1);
+
+namespace InstanceMethodsParameterScopeTest;
+
+class HelloWorld
+{
+	public function __construct()
+	{
+	}
+
+	public function foo(\DateTime $d): void
+	{
+	}
+
+	public function bar(\Baz\Waldo $d): void
+	{
+	}
+}