progress on 'spawn'

tests/parallel/tdeepcopy.nim

@@ -0,0 +1,18 @@
+discard """
+  output: '''13 abc'''
+"""
+
+type
+  PBinaryTree = ref object
+    le, ri: PBinaryTree
+    value: int
+
+
+proc main =
+  var x: PBinaryTree
+  deepCopy(x, PBinaryTree(ri: PBinaryTree(le: PBinaryTree(value: 13))))
+  var y: string
+  deepCopy y, "abc"
+  echo x.ri.le.value, " ", y
+
+main()