fixed wrong spec decoding in core.basicAt and core.basicAtPut functions

src/kernel.hak

@@ -136,15 +136,18 @@ printf "----------------------------------------\n"
 k := #[1 2 3]
 printf "%O\n" (k:basicAt 2)
 
-class Z: Object [ a b c ] {
+class (#varying) Z: Object [ a b c ] {
 	fun(#classinst) new() {
 		self.a := 10
 		self.b := 20
 		self.c := 30
+printf "Z:new called\n"
 	}
 }
-##k := (Z:basicNew 0)
-k := (Z:new)
+
+k := (Z:basicNew 10)
+##k := (Z:new)
+k:basicAtPut 2 "hello"
+k:basicAtPut 3 "world"
+printf "----------------------------------------\n"
 printf "%O\n" (k:basicAt 2)
-
-