#KT-537 adds A.to(B) helper method to make easy creation of map literals: hashMap("a" to 3, "b" to 6) etc

libraries/stdlib/src/kotlin/Standard.kt

@@ -73,6 +73,15 @@ public inline fun <T> Iterator<T>.toSortedSet() : SortedSet<T> = toCollection(Tr
  */
 public inline fun <T> Iterator<T>.toSortedSet(comparator: Comparator<T>) : SortedSet<T> = toCollection(TreeSet<T>(comparator))
 
+
+/**
+ * Creates a tuple of type [[#(A,B)]] from this and *that* which can be useful for creating [[Map]] literals
+ * with less noise, for example
+
+ * @includeFunctionBody ../../test/MapTest.kt createUsingTo
+ */
+public inline fun <A,B> A.to(that: B): #(A, B) = #(this, that)
+
 /**
 Run function f
 */

libraries/stdlib/test/MapTest.kt

@@ -119,6 +119,13 @@ class MapTest {
         assertEquals(2, map.get("b"))
     }
 
+    test fun createUsingTo() {
+        val map = hashMap("a" to 1, "b" to 2)
+        assertEquals(2, map.size)
+        assertEquals(1, map.get("a"))
+        assertEquals(2, map.get("b"))
+    }
+
     test fun createLinkedMap() {
         val map = linkedMap(#("c", 3), #("b", 2), #("a", 1))
         assertEquals(1, map.get("a"))