Made vararg parameters have Array<out T> type

instead of simply Array<T>
  #KT-1638 Fixed
  #KT-2163 Fixed
  #KT-3213 Fixed
  #KT-4172 Fixed
  #KT-5534 Fixed

compiler/testData/diagnostics/tests/VarargTypes.kt

@@ -10,7 +10,7 @@ fun fool(vararg a : Long) : LongArray = a
 fun food(vararg a : Double) : DoubleArray = a
 fun foof(vararg a : Float) : FloatArray = a
 fun foob(vararg a : Boolean) : BooleanArray = a
-fun foos(vararg a : String) : Array<String> = a
+fun foos(vararg a : String) : Array<out String> = a
 
 fun test() {
     Arrays.asList(1, 2, 3)

compiler/testData/diagnostics/tests/inference/mapFunction.kt

@@ -25,7 +25,7 @@ fun foo() {
 // ---------------------
 // copy from kotlin util
 
-fun <T> array(vararg t : T) : Array<T> = t
+fun <T> array(vararg t : T) : Array<T> = t as Array<T>
 
 fun <T, R> Array<T>.map(<!UNUSED_PARAMETER!>transform<!> : (T) -> R) : List<R> {<!NO_RETURN_IN_FUNCTION_WITH_BLOCK_BODY!>}<!>
 

compiler/testData/diagnostics/tests/inference/regressions/kt2200.kt

@@ -11,4 +11,4 @@ fun main(args: Array<String>) {
 }
 
 //from library
-fun <T> array(vararg t : T) : Array<T> = t
+fun <T> array(vararg t : T) : Array<T> = t as Array<T>

compiler/testData/diagnostics/tests/inference/regressions/kt2294.kt

@@ -13,4 +13,4 @@ public fun test()
 
 //--------------------
 
-fun <T> array(vararg t : T) : Array<T> = t
+fun <T> array(vararg t : T) : Array<T> = t as Array<T>

compiler/testData/diagnostics/tests/varargs/kt2163.kt

@@ -0,0 +1,7 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+fun printAll(vararg a : Any) {}
+
+fun main(args: Array<String>) {
+    printAll(*args) // Shouldn't be an error
+}

compiler/testData/diagnostics/tests/varargs/kt2163.txt

@@ -0,0 +1,4 @@
+package
+
+internal fun main(/*0*/ args: kotlin.Array<kotlin.String>): kotlin.Unit
+internal fun printAll(/*0*/ vararg a: kotlin.Any /*kotlin.Array<out kotlin.Any>*/): kotlin.Unit

compiler/testData/diagnostics/tests/varargs/varargsAndOut1.kt

@@ -0,0 +1,13 @@
+// !CHECK_TYPE
+
+fun test(vararg a: String) {
+    a checkType { it : _<Array<out String>> }
+
+    foo(a) checkType { it : _<Array<out String>> }
+}
+
+fun <T> test1(vararg t: T) {
+    t checkType { it : _<Array<out T>> }
+}
+
+fun <T> foo(a: Array<T>): Array<T> = a

compiler/testData/diagnostics/tests/varargs/varargsAndOut1.txt

@@ -0,0 +1,5 @@
+package
+
+internal fun </*0*/ T> foo(/*0*/ a: kotlin.Array<T>): kotlin.Array<T>
+internal fun test(/*0*/ vararg a: kotlin.String /*kotlin.Array<out kotlin.String>*/): kotlin.Unit
+internal fun </*0*/ T> test1(/*0*/ vararg t: T /*kotlin.Array<out T>*/): kotlin.Unit

compiler/testData/diagnostics/tests/varargs/varargsAndOut2.kt

@@ -0,0 +1,9 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+fun bar(vararg a: String) {}
+
+fun test2(a: Array<String>, b: Array<out String>) {
+    bar(*a)
+    bar(*b)
+    bar("", *a, *b, "")
+}

compiler/testData/diagnostics/tests/varargs/varargsAndOut2.txt

@@ -0,0 +1,4 @@
+package
+
+internal fun bar(/*0*/ vararg a: kotlin.String /*kotlin.Array<out kotlin.String>*/): kotlin.Unit
+internal fun test2(/*0*/ a: kotlin.Array<kotlin.String>, /*1*/ b: kotlin.Array<out kotlin.String>): kotlin.Unit