From c97124ea6004b0aae34619c1bf1e59b29a9f9078 Mon Sep 17 00:00:00 2001
From: Nikolay Igotti <olonho@users.noreply.github.com>
Date: Fri, 13 Apr 2018 15:26:44 +0300
Subject: [PATCH] Make weak reference work only on non-nullable types. (#1496)

---
 runtime/src/main/kotlin/konan/ref/Weak.kt | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/runtime/src/main/kotlin/konan/ref/Weak.kt b/runtime/src/main/kotlin/konan/ref/Weak.kt
index 198dbe0b435..f31e6173273 100644
--- a/runtime/src/main/kotlin/konan/ref/Weak.kt
+++ b/runtime/src/main/kotlin/konan/ref/Weak.kt
@@ -21,13 +21,12 @@ package konan.ref
  * retrieve a strong reference to an object, or return null, if object was already destoyed by
  * the memory manager.
  */
-class WeakReference<T> {
+class WeakReference<T : Any> {
     /**
      * Creates a weak reference object pointing to an object. Weak reference doesn't prevent
      * removing object, and is nullified once object is collected.
      */
     constructor(referred: T) {
-        if (referred == null) throw Error("Weak reference to null?")
         pointer = getWeakReferenceCounter(referred)
     }
 
@@ -49,4 +48,4 @@ class WeakReference<T> {
  * Returns either reference to an object or null, if it was collected.
  */
 @Suppress("NON_PUBLIC_CALL_FROM_PUBLIC_INLINE")
-public inline fun <reified T> WeakReference<T>.get() = pointer?.get() as T?
+public inline fun <reified T : Any> WeakReference<T>.get() = pointer?.get() as T?