Specialize plus operator for UArrays (KT-28397)

libraries/stdlib/test/collections/ArraysTest.kt

@@ -99,7 +99,7 @@ class ArraysTest {
         assertEquals(0.toShort(), arr[0])
         assertEquals(1.toShort(), arr[1])
     }
-    
+
     @Test fun intArray() {
         val arr = IntArray(2)
 
@@ -107,7 +107,7 @@ class ArraysTest {
         assertEquals(0, arr[0])
         assertEquals(0, arr[1])
     }
-    
+
     @Test fun intArrayInit() {
         val arr = IntArray(2) { it.toInt() }
 
@@ -115,7 +115,7 @@ class ArraysTest {
         assertEquals(0.toInt(), arr[0])
         assertEquals(1.toInt(), arr[1])
     }
-    
+
     @Test fun longArray() {
         val arr = LongArray(2)
 
@@ -141,7 +141,7 @@ class ArraysTest {
         assertEquals(expected, arr[0])
         assertEquals(expected, arr[1])
     }
-    
+
     @Test fun floatArrayInit() {
         val arr = FloatArray(2) { it.toFloat() }
 
@@ -916,7 +916,7 @@ class ArraysTest {
             byteArrayOf(1, 2, 3), byteArrayOf(4, 5, 6),
             byteArrayOf(5, 6, 3), byteArrayOf(6, 3, 3), byteArrayOf(6, 6, 3)
         )
-        
+
         doTest(
             CharArray::copyInto, ::assertArrayNotSameButEquals, CharArray::contentToString,
             charArrayOf('a', 'b', 'c'), charArrayOf('e', 'f', 'g'),

libraries/stdlib/test/collections/UnsignedArraysTest.kt

@@ -9,6 +9,9 @@ package test.collections
 import test.collections.behaviors.collectionBehavior
 import kotlin.test.*
 
+fun assertArrayContentEquals(expected: UIntArray, actual: UIntArray, message: String = "") { assertTrue(expected contentEquals actual, message) }
+
+
 class UnsignedArraysTest {
 
     @Test
@@ -228,4 +231,11 @@ class UnsignedArraysTest {
         }
     }
 
+    @Test
+    fun plus() {
+        assertArrayContentEquals(uintArrayOf(1u, 2u, 3u), uintArrayOf(1u, 2u) + 3u)
+        assertArrayContentEquals(uintArrayOf(1u, 2u, 3u, 4u), uintArrayOf(1u, 2u) + listOf(3u, 4u))
+        assertArrayContentEquals(uintArrayOf(1u, 2u, 3u, 4u), uintArrayOf(1u, 2u) + uintArrayOf(3u, 4u))
+    }
+
 }