ObjectType - make class line part of the cache key

src/Type/ObjectType.php

@@ -391,7 +391,15 @@ public function describe(VerbosityLevel $level): string
 			$preciseNameCallback,
 			$preciseWithSubtracted,
 			function () use ($preciseWithSubtracted): string {
-				return $preciseWithSubtracted() . '-' . static::class . '-' . $this->describeAdditionalCacheKey();
+				$reflection = $this->classReflection;
+				$line = '';
+				if ($reflection !== null) {
+					$line .= '-';
+					$line .= (string) $reflection->getNativeReflection()->getStartLine();
+					$line .= '-';
+				}
+
+				return $preciseWithSubtracted() . '-' . static::class . '-' . $line . $this->describeAdditionalCacheKey();
 			}
 		);
 	}
@@ -412,6 +420,13 @@ private function describeCache(): string
 			$description .= sprintf('~%s', $this->subtractedType->describe(VerbosityLevel::cache()));
 		}
 
+		$reflection = $this->classReflection;
+		if ($reflection !== null) {
+			$description .= '-';
+			$description .= (string) $reflection->getNativeReflection()->getStartLine();
+			$description .= '-';
+		}
+
 		return $description;
 	}
 

tests/PHPStan/Analyser/AnalyserIntegrationTest.php

@@ -441,6 +441,12 @@ public function testBug5527(): void
 		$this->assertCount(0, $errors);
 	}
 
+	public function testBug5639(): void
+	{
+		$errors = $this->runAnalyse(__DIR__ . '/data/bug-5639.php');
+		$this->assertCount(0, $errors);
+	}
+
 	/**
 	 * @param string $file
 	 * @return \PHPStan\Analyser\Error[]

tests/PHPStan/Analyser/data/bug-5639.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Bug5639;
+
+if (\version_compare(\PHP_VERSION, '7.0', '<'))
+{
+	class Foo extends \Exception {
+		function __toString(): string {
+			$result = \sprintf("%s\n\nin %s on line %s", $this->message, $this->file, $this->line);
+			return $result;
+		}
+	}
+}
+else
+{
+	class Foo extends \Error {
+		function __toString(): string {
+			$result = \sprintf("%s\n\nin %s on line %s", $this->message, $this->file, $this->line);
+			return $result;
+		}
+	}
+}