Clean up any garbage references when awaiting rejected promise

Author: clue

src/functions.php

@@ -246,6 +246,25 @@ function (mixed $throwable) use (&$rejected, &$rejectedThrowable, &$fiber): void
                 $throwable = new \UnexpectedValueException(
                     'Promise rejected with unexpected value of type ' . (is_object($throwable) ? get_class($throwable) : gettype($throwable))
                 );
+
+                // avoid garbage references by replacing all closures in call stack.
+                // what a lovely piece of code!
+                $r = new \ReflectionProperty('Exception', 'trace');
+                $trace = $r->getValue($throwable);
+
+                // Exception trace arguments only available when zend.exception_ignore_args is not set
+                // @codeCoverageIgnoreStart
+                foreach ($trace as $ti => $one) {
+                    if (isset($one['args'])) {
+                        foreach ($one['args'] as $ai => $arg) {
+                            if ($arg instanceof \Closure) {
+                                $trace[$ti]['args'][$ai] = 'Object(' . \get_class($arg) . ')';
+                            }
+                        }
+                    }
+                }
+                // @codeCoverageIgnoreEnd
+                $r->setValue($throwable, $trace);
             }
 
             if ($fiber === null) {

tests/AwaitTest.php

@@ -53,9 +53,15 @@ public function testAwaitThrowsUnexpectedValueExceptionWhenPromiseIsRejectedWith
             $reject(null);
         });
 
-        $this->expectException(\UnexpectedValueException::class);
-        $this->expectExceptionMessage('Promise rejected with unexpected value of type NULL');
-        $await($promise);
+        try {
+            $await($promise);
+        } catch (\UnexpectedValueException $exception) {
+            $this->assertInstanceOf(\UnexpectedValueException::class, $exception);
+            $this->assertEquals('Promise rejected with unexpected value of type NULL', $exception->getMessage());
+            $this->assertEquals(0, $exception->getCode());
+            $this->assertNull($exception->getPrevious());
+            $this->assertNotEquals('', $exception->getTraceAsString());
+        }
     }
 
     /**