From e00cdfc8e1f7840613709d69504ef80cbfe51c23 Mon Sep 17 00:00:00 2001
From: Ilya Ryzhenkov <orangy@jetbrains.com>
Date: Tue, 17 Feb 2015 20:41:10 +0300
Subject: [PATCH] toSortedMap() without a comparator requires keys that are
 Comparable.

---
 libraries/stdlib/src/kotlin/collections/MapsJVM.kt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/stdlib/src/kotlin/collections/MapsJVM.kt b/libraries/stdlib/src/kotlin/collections/MapsJVM.kt
index 3432ecd03de..5fe02ce10ed 100644
--- a/libraries/stdlib/src/kotlin/collections/MapsJVM.kt
+++ b/libraries/stdlib/src/kotlin/collections/MapsJVM.kt
@@ -17,7 +17,7 @@ public fun <K, V> MutableMap<K, V>.set(key: K, value: V): V? = put(key, value)
  *
  * @sample test.collections.MapJVMTest.toSortedMap
  */
-public fun <K : Any, V> Map<K, V>.toSortedMap(): SortedMap<K, V> = TreeMap(this)
+public fun <K : Comparable<K>, V> Map<K, V>.toSortedMap(): SortedMap<K, V> = TreeMap(this)
 
 /**
  * Converts this [Map] to a [SortedMap] using the given [comparator] so that iteration order will be in the order