Include previous exceptions when reporting unhandled promise rejections

src/Internal/RejectedPromise.php

@@ -37,8 +37,7 @@ public function __destruct()
 
         $handler = set_rejection_handler(null);
         if ($handler === null) {
-            $message = 'Unhandled promise rejection with ' . \get_class($this->reason) . ': ' . $this->reason->getMessage() . ' in ' . $this->reason->getFile() . ':' . $this->reason->getLine() . PHP_EOL;
-            $message .= 'Stack trace:' . PHP_EOL . $this->reason->getTraceAsString();
+            $message = 'Unhandled promise rejection with ' . $this->reason;
 
             \error_log($message);
             return;
@@ -47,8 +46,9 @@ public function __destruct()
         try {
             $handler($this->reason);
         } catch (\Throwable $e) {
-            $message = 'Fatal error: Uncaught ' . \get_class($e) . ' from unhandled promise rejection handler: ' . $e->getMessage() . ' in ' . $e->getFile() . ':' . $e->getLine() . PHP_EOL;
-            $message .= 'Stack trace:' . PHP_EOL . $e->getTraceAsString();
+            \preg_match('/^([^:\s]++)(.*+)$/sm', (string) $e, $match);
+            \assert(isset($match[1], $match[2]));
+            $message = 'Fatal error: Uncaught ' . $match[1] . ' from unhandled promise rejection handler' . $match[2];
 
             \error_log($message);
             exit(255);

tests/FunctionRejectTestShouldReportUnhandledWithPreviousExceptions.phpt

@@ -0,0 +1,27 @@
+--TEST--
+Calling reject() without any handlers should report unhandled rejection with all previous exceptions
+--INI--
+# suppress legacy PHPUnit 7 warning for Xdebug 3
+xdebug.default_enable=
+--FILE--
+<?php
+
+use function React\Promise\reject;
+
+require __DIR__ . '/../vendor/autoload.php';
+
+reject(new RuntimeException('foo', 42, new \OverflowException('bar', 1000, new \InvalidArgumentException())));
+
+?>
+--EXPECTF--
+Unhandled promise rejection with InvalidArgumentException in %s:%d
+Stack trace:
+#0 %A{main}
+
+Next OverflowException: bar in %s:%d
+Stack trace:
+#0 %A{main}
+
+Next RuntimeException: foo in %s:%d
+Stack trace:
+#0 %A{main}

tests/FunctionRejectTestThenMismatchThrowsTypeErrorAndShouldReportUnhandledForTypeErrorOnlyOnPhp7.phpt

@@ -18,7 +18,7 @@ reject(new RuntimeException('foo'))->then(null, function (UnexpectedValueExcepti
 
 ?>
 --EXPECTF--
-Unhandled promise rejection with TypeError: Argument 1 passed to {closure}() must be an instance of UnexpectedValueException, instance of RuntimeException given, called in %s/src/Internal/RejectedPromise.php on line %d in %s:%d
+Unhandled promise rejection with TypeError: Argument 1 passed to {closure}() must be an instance of UnexpectedValueException, instance of RuntimeException given, called in %s/src/Internal/RejectedPromise.php on line %d and defined in %s:%d
 Stack trace:
 #0 %s/src/Internal/RejectedPromise.php(%d): {closure}(%S)
 #1 %s(%d): React\Promise\Internal\RejectedPromise->then(%S)

tests/FunctionRejectTestThenMismatchThrowsTypeErrorAndShouldReportUnhandledForTypeErrorOnlyOnPhp8.phpt

@@ -18,7 +18,7 @@ reject(new RuntimeException('foo'))->then(null, function (UnexpectedValueExcepti
 
 ?>
 --EXPECTF--
-Unhandled promise rejection with TypeError: {closure%S}(): Argument #1 ($unexpected) must be of type UnexpectedValueException, RuntimeException given, called in %s/src/Internal/RejectedPromise.php on line %d in %s:%d
+Unhandled promise rejection with TypeError: {closure%S}(): Argument #1 ($unexpected) must be of type UnexpectedValueException, RuntimeException given, called in %s/src/Internal/RejectedPromise.php on line %d and defined in %s:%d
 Stack trace:
 #0 %s/src/Internal/RejectedPromise.php(%d): {closure%S}(%S)
 #1 %s(%d): React\Promise\Internal\RejectedPromise->then(%S)

tests/FunctionSetRejectionHandlerThatThrowsShouldTerminateProgramForUnhandledWithPreviousExceptions.phpt

@@ -0,0 +1,34 @@
+--TEST--
+The callback given to set_rejection_handler() should not throw an exception or the program should terminate for unhandled rejection with all previous exceptions
+--INI--
+# suppress legacy PHPUnit 7 warning for Xdebug 3
+xdebug.default_enable=
+--FILE--
+<?php
+
+use function React\Promise\reject;
+use function React\Promise\set_rejection_handler;
+
+require __DIR__ . '/../vendor/autoload.php';
+
+set_rejection_handler(function (Throwable $e): void {
+    throw new RuntimeException('foo', 42, new \OverflowException('bar', 1000, new \InvalidArgumentException()));
+});
+
+reject(new RuntimeException('foo'));
+
+echo 'NEVER';
+
+?>
+--EXPECTF--
+Fatal error: Uncaught InvalidArgumentException from unhandled promise rejection handler in %s:%d
+Stack trace:
+#0 %A{main}
+
+Next OverflowException: bar in %s:%d
+Stack trace:
+#0 %A{main}
+
+Next RuntimeException: foo in %s:%d
+Stack trace:
+#0 %A{main}