Regression test

Closes phpstan/phpstan#12327

Author: ondrejmirtes

tests/PHPStan/Analyser/AnalyserIntegrationTest.php

@@ -801,6 +801,15 @@ public function testBug7214(): void
 		$this->assertSame(6, $errors[0]->getLine());
 	}
 
+	public function testBug12327(): void
+	{
+		$errors = $this->runAnalyse(__DIR__ . '/data/bug-12327.php');
+		$this->assertCount(1, $errors);
+
+		$this->assertSame('Class Bug12327\DoesNotMatter uses unknown trait Bug12327\ThisTriggersTheIssue.', $errors[0]->getMessage());
+		$this->assertSame(15, $errors[0]->getLine());
+	}
+
 	public function testBug7215(): void
 	{
 		$errors = $this->runAnalyse(__DIR__ . '/data/bug-7215.php');

tests/PHPStan/Analyser/data/bug-12327.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Bug12327;
+
+trait SomeInternalTrait__TheNameIsIrrelevant
+{
+	public function something(): void {}
+}
+
+class DoesNotMatter
+{
+	use SomeInternalTrait__TheNameIsIrrelevant {
+		SomeInternalTrait__TheNameIsIrrelevant::something as methodAlias;
+	}
+	use ThisTriggersTheIssue;
+
+	public function anything(): void {}
+}