Code to demonstrate a crash in the Nimrod compiler. Its important that both files are separate, combining the two makes the crash go away.

maxrectpack.nim

import
  rectangle

type 
  MaxRectPacker* [T] = object
    initialWidth, initialHeight: T
    freeGeometry: seq[Rectangle[T]]

proc TryGet* [T](self: var MaxRectPacker[T];
  width, height: T;
  outRectangle: var Rectangle[T]): bool =
    var rect : Rectangle[T]
    return false

when isMainModule:
  proc FourCorners() =
    var packer  : MaxRectPacker[int]
    var outRect : Rectangle[int]
    packer.TryGet(32, 32, outRect)
  FourCorners()

rectangle.nim

type
  Rectangle*[T] = object
    Left*, Top*, Right*, Bottom*: T

proc Set*[T](self: var Rectangle[T]; lf, tp, bm, rg: T) =
  ## Modifies the rectangle in-place, setting each element of the
  ## rectangle in a single procedure call.
  self.Left   = lf
  self.Top    = tp
  self.Bottom = bm
  self.Right  = rg