Add minimal generics and typed callable casts

lynglib/src/commonTest/kotlin/StdlibTest.kt

@@ -17,10 +17,8 @@
 
 import kotlinx.coroutines.test.runTest
 import net.sergeych.lyng.eval
-import kotlin.test.Ignore
 import kotlin.test.Test
 
-@Ignore
 class StdlibTest {
     @Test
     fun testIterableFilter() = runTest {