{.reorder: on.} pragma causes import errors

[genotrance]

Consider:

# a.nim

{.reorder: on.}

type
  abc* = object
    test: def

type
  def = object
    test2: int

Let's import this in another file:

# b.nim

import a

a.nim compiles just fine. But b.nim compilation fails:

> nim c b.nim

Hint: used config file '\nim-0.18.0\config\nim.cfg' [Conf]
Hint: system [Processing]
Hint: b [Processing]
Hint: a [Processing]
a.nim(1, 2) Error: implementation of 'a' expected

I have tested this with #head, 0.18.0 and 0.17.2 and it is still broken. This is gating the libui wrapper I'm working on using nimgen since it has multiple forward declarations and it is not trivial to automate moving around the code to avoid the forward declarations and {.reorder: on.}.

[awr1]

{.reorder: on.} should also be added to docs