extern generics classes fix, documentation on extern classes updated

lynglib/src/commonTest/kotlin/ScriptTest.kt

@@ -30,8 +30,8 @@ import kotlinx.serialization.json.JsonPrimitive
 import kotlinx.serialization.json.encodeToJsonElement
 import net.sergeych.lyng.*
 import net.sergeych.lyng.obj.*
-import net.sergeych.lyng.thisAs
 import net.sergeych.lyng.pacman.InlineSourcesImportProvider
+import net.sergeych.lyng.thisAs
 import net.sergeych.mp_tools.globalDefer
 import net.sergeych.tools.bm
 import kotlin.test.*
@@ -3097,19 +3097,6 @@ class ScriptTest {
         )
     }
 
-    @Test
-    fun testExternClassMembersMustBeExplicitlyExtern() = runTest {
-        assertFailsWith<ScriptError> {
-            eval(
-                """
-                extern class HostClass {
-                    fun doSomething(): Int
-                }
-                """.trimIndent()
-            )
-        }
-    }
-
     @Test
     fun testExternExtension() = runTest {
         eval(

lynglib/src/commonTest/kotlin/TypesTest.kt

@@ -621,24 +621,23 @@ class TypesTest {
         eval("""
             extern fun f<T>(x: T): T 
             extern class Cell<T> {
-                extern var value: T
+                var value: T
             }
         """)
     }
 
     @Test
-    fun testExternClassMemberMustBeExternMessage() = runTest {
+    fun testExternClassMemberInitializerStillFailsWithoutExplicitExtern() = runTest {
         val e = assertFailsWith<ScriptError> {
             eval(
                 """
                 extern class Cell<T> {
-                    var value: T
+                    var value: T = 1
                 }
                 """.trimIndent()
             )
         }
-        assertTrue(e.message?.contains("must be declared extern") == true)
-        assertTrue(e.message?.contains("extern var value") == true)
+        assertTrue(e.message?.contains("extern variable value cannot have an initializer or delegate") == true)
     }
 
 //    @Test fun nonTrivialOperatorsTest() = runTest {