Fixed expression assignment throwing away native expression types for…

… treatPhpDocTypesAsCertain: false

src/Analyser/MutatingScope.php

@@ -3171,6 +3171,7 @@ public function invalidateExpression(Expr $expressionToInvalidate, bool $require
 	{
 		$exprStringToInvalidate = $this->getNodeKey($expressionToInvalidate);
 		$moreSpecificTypeHolders = $this->moreSpecificTypes;
+		$nativeExpressionTypes = $this->nativeExpressionTypes;
 		foreach (array_keys($moreSpecificTypeHolders) as $exprString) {
 			$exprString = (string) $exprString;
 			if (Strings::startsWith($exprString, $exprStringToInvalidate)) {
@@ -3180,6 +3181,7 @@ public function invalidateExpression(Expr $expressionToInvalidate, bool $require
 				$nextLetter = substr($exprString, strlen($exprStringToInvalidate), 1);
 				if (Strings::match($nextLetter, '#[a-zA-Z_0-9\x7f-\xff]#') === null) {
 					unset($moreSpecificTypeHolders[$exprString]);
+					unset($nativeExpressionTypes[$exprString]);
 					continue;
 				}
 			}
@@ -3195,6 +3197,7 @@ public function invalidateExpression(Expr $expressionToInvalidate, bool $require
 			}
 
 			unset($moreSpecificTypeHolders[$exprString]);
+			unset($nativeExpressionTypes[$exprString]);
 		}
 
 		return $this->scopeFactory->create(
@@ -3209,7 +3212,7 @@ public function invalidateExpression(Expr $expressionToInvalidate, bool $require
 			$this->anonymousFunctionReflection,
 			$this->inFirstLevelStatement,
 			$this->currentlyAssignedExpressions,
-			[],
+			$nativeExpressionTypes,
 			[],
 			$this->afterExtractCall,
 			$this->parentScope
@@ -3993,6 +3996,10 @@ public function debug(): array
 			$key = sprintf('const %s', $name);
 			$descriptions[$key] = $type->describe(VerbosityLevel::precise());
 		}
+		foreach ($this->nativeExpressionTypes as $exprString => $nativeType) {
+			$key = sprintf('native %s', $exprString);
+			$descriptions[$key] = $nativeType->describe(VerbosityLevel::precise());
+		}
 
 		return $descriptions;
 	}

tests/PHPStan/Analyser/NodeScopeResolverTest.php

@@ -10352,6 +10352,11 @@ public function dataBug4099(): array
 		return $this->gatherAssertTypes(__DIR__ . '/data/bug-4099.php');
 	}
 
+	public function dataBug3760(): array
+	{
+		return $this->gatherAssertTypes(__DIR__ . '/data/bug-3760.php');
+	}
+
 	/**
 	 * @param string $file
 	 * @return array<string, mixed[]>
@@ -10535,6 +10540,7 @@ private function gatherAssertTypes(string $file): array
 	 * @dataProvider dataBug3880
 	 * @dataProvider dataIncDecInConditions
 	 * @dataProvider dataBug4099
+	 * @dataProvider dataBug3760
 	 * @param string $assertType
 	 * @param string $file
 	 * @param mixed ...$args

tests/PHPStan/Analyser/data/bug-3760.php

@@ -0,0 +1,47 @@
+<?php declare(strict_types = 1);
+
+namespace Bug3760;
+
+use function PHPStan\Analyser\assertNativeType;
+use function PHPStan\Analyser\assertType;
+
+class HelloWorld
+{
+	/**
+	 * Whether the type allows covariant matches
+	 *
+	 * @var bool
+	 */
+	public $allowsCovariance;
+
+	/**
+	 * Whether the type allows contravariant matches
+	 *
+	 * @var bool
+	 */
+	public $allowsContravariance;
+
+	/**
+	 * @param bool $allowsCovariance
+	 * @param bool $allowsContravariance
+	 */
+	protected function __construct($allowsCovariance, $allowsContravariance)
+	{
+		assertType('bool', $allowsCovariance);
+		assertNativeType('mixed', $allowsCovariance);
+		assertType('bool', $allowsContravariance);
+		assertNativeType('mixed', $allowsContravariance);
+		$this->allowsCovariance = (bool)$allowsCovariance;
+
+		assertType('bool', $allowsCovariance);
+		assertNativeType('mixed', $allowsCovariance);
+		assertType('bool', $allowsContravariance);
+		assertNativeType('mixed', $allowsContravariance);
+		$this->allowsContravariance = (bool)$allowsContravariance;
+
+		assertType('bool', $allowsCovariance);
+		assertNativeType('mixed', $allowsCovariance);
+		assertType('bool', $allowsContravariance);
+		assertNativeType('mixed', $allowsContravariance);
+	}
+}