don't complain about unsafe static call to method known to be public

src/Rules/Methods/CallPrivateMethodThroughStaticRule.php

@@ -36,7 +36,7 @@ public function processNode(Node $node, Scope $scope): array
 			return [];
 		}
 
-		$classType = $scope->resolveTypeByName($className);
+		$classType = $scope->getType(new Node\Expr\ClassConstFetch(new Name('static'), 'class'))->getClassStringObjectType();
 		if (!$classType->hasMethod($methodName)->yes()) {
 			return [];
 		}

tests/PHPStan/Rules/Methods/CallPrivateMethodThroughStaticRuleTest.php

@@ -26,4 +26,14 @@ public function testRule(): void
 		]);
 	}
 
+	public function testInstanceof(): void
+	{
+		$this->analyse([__DIR__ . '/data/call-private-method-static-instanceof.php'], [
+			[
+				'Unsafe call to private method CallPrivateMethodStaticInstanceof\FooBase::fooPrivate() through static::.',
+				27,
+			],
+		]);
+	}
+
 }

tests/PHPStan/Rules/Methods/data/call-private-method-static-instanceof.php

@@ -0,0 +1,29 @@
+<?php declare(strict_types=1);
+
+namespace CallPrivateMethodStaticInstanceof;
+
+interface FooInterface
+{
+	public static function fooPrivate(): int;
+}
+
+class FooBase
+{
+	private static function fooPrivate(): string
+	{
+		return 'a';
+	}
+
+	public function bar(): void
+	{
+		if ($this instanceof FooInterface) {
+			static::fooPrivate();
+		}
+
+		if (is_a(static::class, FooInterface::class, true)) {
+			static::fooPrivate();
+		}
+
+		static::fooPrivate();
+	}
+}