JS/RTTI: in expressions like a as T when inferred type for a is S, where S <: T, don't generate type checking

js/js.translator/testData/expression/cast/cases/noRuntimeTypeCheck.kt

@@ -0,0 +1,28 @@
+package foo
+
+// CHECK_METHOD_NOT_CALLED_IN_SCOPE: scope=box function=isType
+
+open class A()
+
+class B() : A()
+
+fun box(): String {
+    assertTrue(B() is A)
+    assertTrue(B() is A?)
+    assertTrue(B() is B)
+    assertTrue(B() is B?)
+    assertTrue((B() as B?) is A?)
+    assertTrue((null as A?) is A?)
+
+    assertNotEquals(null, B() as? A)
+    assertNotEquals(null, B() as? A?)
+    assertNotEquals(null, B() as? B)
+    assertNotEquals(null, B() as? B?)
+
+    assertNotEquals(null, B() as A)
+    assertNotEquals(null, B() as A?)
+    assertNotEquals(null, B() as B)
+    assertNotEquals(null, B() as B?)
+
+    return "OK"
+}

js/js.translator/testData/kotlin_lib.js

@@ -17,7 +17,7 @@
 (function (Kotlin) {
     "use strict";
 
-    Kotlin.CharSequence = Kotlin.createTraitNow(null);
+    var CharSequence = Kotlin.createTraitNow(null);
 
     // Shims for String
     if (typeof String.prototype.startsWith === "undefined") {
@@ -138,7 +138,7 @@
     };
     
     Kotlin.isCharSequence = function (value) {
-        return typeof value === "string" || Kotlin.isType(value, Kotlin.CharSequence);
+        return typeof value === "string" || Kotlin.isType(value, CharSequence);
     };
 
     Kotlin.charInc = function (value) {
@@ -1146,7 +1146,7 @@
     };
 
 
-    Kotlin.StringBuilder = Kotlin.createClassNow([Kotlin.CharSequence],
+    Kotlin.StringBuilder = Kotlin.createClassNow([CharSequence],
         function (content) {
             this.string = typeof(content) == "string" ? content : "";
         }, {