From 3fb87e2c1868ddca7dc6dbbf93cc7897458a2af2 Mon Sep 17 00:00:00 2001
From: Aaron Piotrowski <aaron@trowski.com>
Date: Fri, 17 Jul 2020 11:19:36 -0500
Subject: [PATCH] Fix Psalm errors

---
 lib/AsyncGenerator.php | 7 ++++++-
 lib/Deferred.php       | 1 +
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/AsyncGenerator.php b/lib/AsyncGenerator.php
index 8ef0a2d..2fb99b4 100644
--- a/lib/AsyncGenerator.php
+++ b/lib/AsyncGenerator.php
@@ -12,7 +12,7 @@ final class AsyncGenerator implements Stream
     /** @var Internal\EmitSource<TValue, TSend> */
     private $source;
 
-    /** @var Promise<TReturn> */
+    /** @var Coroutine<TReturn>|null */
     private $coroutine;
 
     /** @var \Generator|null */
@@ -121,11 +121,16 @@ final class AsyncGenerator implements Stream
             return $this->coroutine;
         }
 
+        /** @psalm-suppress PossiblyNullArgument */
         $this->coroutine = new Coroutine($this->generator);
         $this->generator = null;
 
         $source = $this->source;
         $this->coroutine->onResolve(static function ($exception) use ($source) {
+            if ($source->isComplete()) {
+                return; // AsyncGenerator object was destroyed.
+            }
+
             if ($exception) {
                 $source->fail($exception);
                 return;
diff --git a/lib/Deferred.php b/lib/Deferred.php
index 8f2ed0f..84d8d6b 100644
--- a/lib/Deferred.php
+++ b/lib/Deferred.php
@@ -43,6 +43,7 @@ final class Deferred
      */
     public function isResolved(): bool
     {
+        /** @psalm-suppress UndefinedInterfaceMethod */
         return $this->resolver->isResolved();
     }