KT-11588 Type aliases

- Nested type aliases
- UNSUPPORTED_TYPEALIAS error (language level < 1.1)
- tests for is/as/as? with type alias

compiler/testData/loadJava/compiledKotlin/typealias/Nested.kt

@@ -0,0 +1,18 @@
+//ALLOW_AST_ACCESS
+package test
+
+open class Pair<T1, T2>
+open class Triple<T1, T2, T3>
+
+class Outer<X> {
+    inner class InnerTest1<A>: Pair<X, A>()
+    typealias Test1<A> = Pair<X, A>
+
+    class Nested<Y> {
+        typealias Test2<B> = Pair<Y, B>
+    }
+
+    inner class Inner<Z> {
+        typealias Test3<C> = Triple<X, Z, C>
+    }
+}

compiler/testData/loadJava/compiledKotlin/typealias/Nested.txt

@@ -0,0 +1,28 @@
+package test
+
+public final class Outer</*0*/ X> {
+    public typealias Test1</*0*/ A>  /*captured type parameters: /*1*/ X*/ = test.Pair<X, A>
+    /*primary*/ public constructor Outer</*0*/ X>()
+
+    public final inner class Inner</*0*/ Z> /*captured type parameters: /*1*/ X*/ {
+        public typealias Test3</*0*/ C>  /*captured type parameters: /*1*/ Z, /*2*/ X*/ = test.Triple<X, Z, C>
+        /*primary*/ public constructor Inner</*0*/ Z>()
+    }
+
+    public final inner class InnerTest1</*0*/ A> /*captured type parameters: /*1*/ X*/ : test.Pair<X, A> {
+        /*primary*/ public constructor InnerTest1</*0*/ A>()
+    }
+
+    public final class Nested</*0*/ Y> {
+        public typealias Test2</*0*/ B>  /*captured type parameters: /*1*/ Y*/ = test.Pair<Y, B>
+        /*primary*/ public constructor Nested</*0*/ Y>()
+    }
+}
+
+public open class Pair</*0*/ T1, /*1*/ T2> {
+    /*primary*/ public constructor Pair</*0*/ T1, /*1*/ T2>()
+}
+
+public open class Triple</*0*/ T1, /*1*/ T2, /*2*/ T3> {
+    /*primary*/ public constructor Triple</*0*/ T1, /*1*/ T2, /*2*/ T3>()
+}