"as" in binary / unary expressions now checked only for original type conversion #KT-10384 Fixed

Also #KT-10386 Fixed

compiler/testData/diagnostics/testsWithStdLib/cast/AsInsideIn.kt

@@ -0,0 +1,20 @@
+// See also KT-10386 
+interface A
+class B : A
+fun foo1(list: List<A>, arg: B?): Boolean {
+    // contains(T): Boolean is deprecated
+    return arg <!DEPRECATION!>in<!> list
+}
+fun foo2(list: List<A>, arg: B?): Boolean {
+    // FAKE: no cast needed
+    return arg as A? in list
+}
+fun foo3(list: List<A>, arg: B?): Boolean {
+    // No warning but KNPE risk
+    return arg!! in list
+}
+// But
+fun foo4(list: List<A>, arg: B): Boolean {
+    // Ok
+    return arg in list
+}