Merge pull request #1075 from flaviut/inlinedocs

Add some documentations and code examples in system

tests/misc/tmissingnilcheck.nim

@@ -0,0 +1,20 @@
+discard """
+  disabled: true
+"""
+
+type
+  PFutureBase = ref object
+    callback: proc () {.closure.}
+
+proc newConnection =
+  iterator newConnectionIter(): PFutureBase {.closure.} =
+    discard
+  var newConnectionIterVar = newConnectionIter
+  var first = newConnectionIterVar()
+
+  proc cb {.closure.} =
+    discard
+  
+  first.callback = cb
+
+newConnection()