tinterf.nim works now

tests/run/tinterf.nim

@@ -0,0 +1,20 @@
+discard """
+  output: '''56'''
+"""
+
+type
+  ITest = tuple[
+    setter: proc(v: int) {.closure.},
+    getter: proc(): int {.closure.}]
+
+proc getInterf(): ITest =
+  var shared: int
+  
+  return (setter: proc (x: int) = shared = x,
+          getter: proc (): int = return shared)
+
+var i = getInterf()
+i.setter(56)
+
+echo i.getter()
+