Generalize file and dir magic constants

Author: ondrejmirtes

src/Reflection/InitializerExprTypeResolver.php

@@ -118,11 +118,11 @@ public function getType(Expr $expr, InitializerExprContext $context): Type
 		}
 		if ($expr instanceof File) {
 			$file = $context->getFile();
-			return $file !== null ? new ConstantStringType($file) : new StringType();
+			return $file !== null ? (new ConstantStringType($file))->generalize(GeneralizePrecision::moreSpecific()) : new StringType();
 		}
 		if ($expr instanceof Dir) {
 			$file = $context->getFile();
-			return $file !== null ? new ConstantStringType(dirname($file)) : new StringType();
+			return $file !== null ? (new ConstantStringType(dirname($file)))->generalize(GeneralizePrecision::moreSpecific()) : new StringType();
 		}
 		if ($expr instanceof Line) {
 			return new ConstantIntegerType($expr->getLine());

tests/PHPStan/Analyser/LegacyNodeScopeResolverTest.php

@@ -2308,11 +2308,11 @@ public function dataBinaryOperations(): array
 				'$line',
 			],
 			[
-				(new ConstantStringType(__DIR__ . '/data'))->describe(VerbosityLevel::precise()),
+				'literal-string&non-falsy-string',
 				'$dir',
 			],
 			[
-				(new ConstantStringType(__DIR__ . '/data/binary.php'))->describe(VerbosityLevel::precise()),
+				'literal-string&non-falsy-string',
 				'$file',
 			],
 			[

tests/PHPStan/Reflection/BetterReflection/SourceLocator/OptimizedSingleFileSourceLocatorTest.php

@@ -10,7 +10,6 @@
 use PHPStan\Type\VerbosityLevel;
 use SingleFileSourceLocatorTestClass;
 use TestSingleFileSourceLocator\AFoo;
-use function str_replace;
 use const PHP_VERSION_ID;
 
 class OptimizedSingleFileSourceLocatorTest extends PHPStanTestCase
@@ -119,7 +118,7 @@ public function dataConst(): array
 			],
 			[
 				'const_with_dir_const',
-				"'" . str_replace('\\', '/', __DIR__ . '/data') . "'",
+				'literal-string&non-falsy-string',
 			],
 			[
 				'OPTIMIZED_SFSL_OBJECT_CONSTANT',