Fix JVM type mapping of arrays of type variables

#KT-4262 Fixed
 #KT-5056 Fixed

compiler/backend/src/org/jetbrains/jet/codegen/state/JetTypeMapper.java

@@ -262,10 +262,6 @@ public class JetTypeMapper {
                 signatureVisitor.writeArrayEnd();
             }
 
-            if (memberType.getConstructor().getDeclarationDescriptor() instanceof TypeParameterDescriptor) {
-                return AsmTypeConstants.getType(Object[].class);
-            }
-
             return Type.getType("[" + boxType(mapType(memberType, kind)).getDescriptor());
         }
 

compiler/testData/codegen/boxWithStdlib/regressions/kt4262.kt

@@ -0,0 +1,10 @@
+fun <E : Enum<E>> Byte.toEnum(clazz : Class<E>) : E =
+    (clazz.getMethod("values").invoke(null) as Array<E>)[this.toInt()]
+
+enum class Letters { A B C }
+
+fun box(): String {
+    val clazz = javaClass<Letters>()
+    val r = 1.toByte().toEnum(clazz)
+    return if (r == Letters.B) "OK" else "Fail: $r"
+}

compiler/testData/codegen/boxWithStdlib/regressions/kt5056.kt

@@ -0,0 +1,4 @@
+fun box(): String {
+    val list = array("a", "c", "b").toSortedList()
+    return if (list.toString() == "[a, b, c]") "OK" else "Fail: $list"
+}

compiler/tests/org/jetbrains/jet/codegen/generated/BlackBoxWithStdlibCodegenTestGenerated.java

@@ -1311,6 +1311,16 @@ public class BlackBoxWithStdlibCodegenTestGenerated extends AbstractBlackBoxCode
             doTestWithStdlib("compiler/testData/codegen/boxWithStdlib/regressions/kt344.kt");
         }
         
+        @TestMetadata("kt4262.kt")
+        public void testKt4262() throws Exception {
+            doTestWithStdlib("compiler/testData/codegen/boxWithStdlib/regressions/kt4262.kt");
+        }
+        
+        @TestMetadata("kt5056.kt")
+        public void testKt5056() throws Exception {
+            doTestWithStdlib("compiler/testData/codegen/boxWithStdlib/regressions/kt5056.kt");
+        }
+        
         @TestMetadata("kt528.kt")
         public void testKt528() throws Exception {
             doTestWithStdlib("compiler/testData/codegen/boxWithStdlib/regressions/kt528.kt");

libraries/stdlib/test/collections/ArraysTest.kt

@@ -202,6 +202,13 @@ class ArraysTest {
         assertEquals(listOf(100L, 200L, 30L), array(50L, 100L, 200L, 30L).slice(1..3))
         assertEquals(listOf(true, false, true), array(true, false, true, true).slice(iter))
     }
+
+    test fun toSortedList() {
+        assertEquals(listOf<Nothing>(), array<Nothing>().toSortedList())
+        assertEquals(listOf(1), array(1).toSortedList())
+        assertEquals(listOf("aab", "aba", "ac"), array("ac", "aab", "aba").toSortedList())
+    }
+
     /*
 
     TODO FIXME ASAP: These currently fail on JS due to missing upto() method on numbers