tests added

compiler/testData/codegen/boxWithStdlib/boxingOptimization/casts.kt

@@ -0,0 +1,17 @@
+
+import kotlin.test.assertEquals
+
+inline fun <R, T> foo(x : R?, block : (R?) -> T) : T {
+    return block(x)
+}
+
+fun box() : String {
+    assertEquals(1L, foo(1) { x -> x!!.toLong() })
+    assertEquals(1.toShort(), foo(1) { x -> x!!.toShort() })
+    assertEquals(1.toByte(), foo(1L) { x -> x!!.toByte() })
+    assertEquals(1.toShort(), foo(1L) { x -> x!!.toShort() })
+    assertEquals('a'.toDouble(), foo('a') { x -> x!!.toDouble() })
+    assertEquals(1.0.toByte(), foo(1.0) { x -> x!!.toByte() })
+
+    return "OK"
+}