Initial support for classes in scripts and REPL

compiler/testData/repl/classes/classInheritance.repl

@@ -0,0 +1,6 @@
+>>> open class A(val result: String) {
+...     fun foo() = result
+... }
+>>> class B : A("OK")
+>>> B().foo()
+OK

compiler/testData/repl/classes/classRedeclaration.repl

@@ -0,0 +1,13 @@
+>>> class A {
+...     fun foo() = "Old"
+... }
+>>> val oldA = A()
+>>> class A {
+...     fun foo() = "New"
+... }
+>>> oldA.foo()
+Old
+>>> A().foo()
+New
+>>> oldA.javaClass == javaClass<A>()
+false

compiler/testData/repl/classes/emptyClass.repl

@@ -0,0 +1,2 @@
+>>> class A
+>>> class B {}

compiler/testData/repl/classes/emptyClassRedeclaration.repl

@@ -0,0 +1,2 @@
+>>> class A
+>>> class A

compiler/testData/repl/classes/enumEntrySubclass.repl

@@ -0,0 +1,11 @@
+>>> enum class E {
+...     FIRST {
+...         override fun foo() = "HELLO"
+...     }
+...     SECOND {
+...         override fun foo() = "WORLD"
+...     }
+...     open fun foo() = "E"
+... }
+>>> E.FIRST.foo() + " " + E.SECOND.foo()
+HELLO WORLD

compiler/testData/repl/classes/import.repl

@@ -0,0 +1,5 @@
+>>> import java.util.Collections
+>>> Collections.emptyList<Nothing>()
+[]
+>>> Collections.singletonList(":|||:")
+[:|||:]

compiler/testData/repl/classes/simpleClass.repl

@@ -0,0 +1,6 @@
+>>> class A { override fun toString() = "A" }
+>>> val a = A()
+>>> a
+A
+>>> a.toString()
+A

compiler/testData/repl/classes/simpleEnum.repl

@@ -0,0 +1,8 @@
+>>> enum class E {
+...     FIRST
+...     SECOND
+... }
+>>> E.values().toList()
+[FIRST, SECOND]
+>>> E.FIRST.javaClass == E.SECOND.javaClass // check that no artificial classes are generated for simple enum entries
+true

compiler/testData/repl/classes/simpleTrait.repl

@@ -0,0 +1,6 @@
+>>> trait A
+>>> trait B : A {
+...    fun foo() = 45
+... }
+>>> javaClass<A>().isAssignableFrom(javaClass<B>())
+true