Error with generic types

[arkt8]

The following code compiles and runs ok, but nimsuggest complains about function calls in assert lines (last two):

type MaybeS = enum Nothing, Just
type Maybe[T] = tuple[fst:MaybeS,snd:T]

proc fromMaybe[T](self:Maybe[T],a:T) : T =
  if self[0] == Nothing :
    return a
  else :
    return self[1]

proc fromJust[T](self:Maybe[T]) : T =
  if self.fst == Just :
    return self.snd
  else :
    raise newException(IOError,"not Just")

let nothing : Maybe[int] = (Nothing,0)
let something : Maybe[int] = (Just,2)

assert fromMaybe(nothing,10) == 10
assert fromJust(something) == 2

Running directly with nimsuggest from terminal return this:

chk     skUnknown               Error   /home/thadeu/Nim/learn/types.nim        156     17      "type mismatch: got <Maybe[system.int]>\x0Abut expected one of:\x0Aproc fromJust[T](s: Maybe[T]): T\x0A  first type mismatch at position: 1\x0A  required type for s: Maybe[fromJust.T]\x0A  but expression \'something\' is of type: Maybe[system.int]\x0A\x0Aexpression: fromJust(something)"    0

Nim version: 1.6.4 (installed with choosenim)

[iacore]

Can reproduce