use stable php-parser with arrow functoin

composer.json

@@ -11,7 +11,7 @@
         "jetbrains/phpstorm-stubs": "^2019.1",
         "nette/robot-loader": "^3.1",
         "nette/utils": "^2.5|^3.0",
-        "nikic/php-parser": "dev-master",
+        "nikic/php-parser": "^4.2.1",
         "phpstan/phpdoc-parser": "0.3.3",
         "phpstan/phpstan": "0.11.6",
         "sebastian/diff": "^3.0",

packages/Php/src/Rector/Closure/ClosureToArrowFunctionRector.php

@@ -59,6 +59,10 @@ CODE_SAMPLE
      */
     public function refactor(Node $node): ?Node
     {
+        if (! class_exists('PhpParser\Node\Expr\ArrowFunction')) {
+            return null;
+        }
+
         if (! $this->isAtLeastPhpVersion('7.4')) {
             return null;
         }

packages/Php/tests/Rector/Closure/ClosureToArrowFunctionRector/ClosureToArrowFunctionRectorTest.php

@@ -9,6 +9,10 @@ final class ClosureToArrowFunctionRectorTest extends AbstractRectorTestCase
 {
     public function test(): void
     {
+        if (! class_exists('PhpParser\Node\Expr\ArrowFunction')) {
+            $this->markTestSkipped('Wait on php-parser release');
+        }
+
         $this->doTestFiles([
             __DIR__ . '/Fixture/fixture.php.inc',
             __DIR__ . '/Fixture/referenced_but_not_used.php.inc',

phpstan.neon

@@ -158,3 +158,6 @@ parameters:
         - '#Anonymous function should have native typehint "string"#'
         - '#Parameter \#2 \.\.\.\$args of function array_merge expects array, array<int, string\>\|false given#'
         - '#Method Rector\\Collector\\CallableCollectorPopulator\:\:populate\(\) should return array<Closure\> but returns array<int\|string, callable\>#'
+
+        # waits on php-parser release
+        - '#ArrowFunction#'