Fix type-specifying for nested assign in === and match condition

Author: ondrejmirtes

src/Analyser/TypeSpecifier.php

@@ -1392,9 +1392,14 @@ public function create(
 		}
 
 		$specifiedExprs = [];
+		if ($expr instanceof AlwaysRememberedExpr) {
+			$specifiedExprs[] = $expr;
+			$expr = $expr->expr;
+		}
 
 		if ($expr instanceof Expr\Assign) {
 			$specifiedExprs[] = $expr->var;
+			$specifiedExprs[] = $expr->expr;
 
 			while ($expr->expr instanceof Expr\Assign) {
 				$specifiedExprs[] = $expr->expr->var;

tests/PHPStan/Analyser/NodeScopeResolverTest.php

@@ -1098,6 +1098,7 @@ public function dataFileAsserts(): iterable
 		}
 		if (PHP_VERSION_ID >= 80000) {
 			yield from $this->gatherAssertTypes(__DIR__ . '/data/loose-comparisons-php8.php');
+			yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-10084.php');
 		}
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/loose-comparisons.php');
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-7563.php');

tests/PHPStan/Analyser/TypeSpecifierTest.php

@@ -752,9 +752,11 @@ public function dataCondition(): iterable
 				),
 				[
 					'$notNullBar' => 'null',
+					'$barOrNull' => 'null',
 				],
 				[
 					'$notNullBar' => '~null',
+					'$barOrNull' => '~null',
 				],
 			],
 			[
@@ -874,9 +876,11 @@ public function dataCondition(): iterable
 				),
 				[
 					'$notNullBar' => '~null',
+					'$barOrNull' => '~null',
 				],
 				[
 					'$notNullBar' => 'null',
+					'$barOrNull' => 'null',
 				],
 			],
 			[
@@ -901,9 +905,11 @@ public function dataCondition(): iterable
 				),
 				[
 					'$notFalseBar' => 'false & ' . self::SURE_NOT_TRUTHY,
+					'$barOrFalse' => 'false',
 				],
 				[
 					'$notFalseBar' => '~false',
+					'$barOrFalse' => '~false',
 				],
 			],
 			[
@@ -949,9 +955,11 @@ public function dataCondition(): iterable
 				),
 				[
 					'$notFalseBar' => '~false',
+					'$barOrFalse' => '~false',
 				],
 				[
 					'$notFalseBar' => 'false & ' . self::SURE_NOT_TRUTHY,
+					'$barOrFalse' => 'false',
 				],
 			],
 			[
@@ -964,9 +972,11 @@ public function dataCondition(): iterable
 				),
 				[
 					'$notFalseBar' => 'Bar',
+					'$barOrFalse' => 'Bar',
 				],
 				[
 					'$notFalseBar' => '~Bar',
+					'$barOrFalse' => '~Bar',
 				],
 			],
 			[

tests/PHPStan/Analyser/data/bug-10084.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Bug10084;
+
+use function PHPStan\Testing\assertType;
+
+function (?int $val) {
+	match ($val) {
+		null => assertType('null', $val),
+		default => assertType('int', $val),
+	};
+};
+
+function (?int $val) {
+	match ($foo = $val) {
+		null => assertType('null', $val),
+		default => assertType('int', $val),
+	};
+};
+
+function (?int $val) {
+	match ($foo = $val) {
+		null => assertType('null', $foo),
+		default => assertType('int', $foo),
+	};
+};