The following program triggers the error.
#lang scheme/load (module draw-sig.ss scheme (provide draw^) (define-signature draw^())) (module big-draw.ss scheme (require lang/posn mzlib/unit mred mred/mred-unit graphics/graphics-sig graphics/graphics-posn-less-unit) (define-values/invoke-unit/infer (export graphics^) (link graphics-posn-less@ standard-mred@)) (provide-signature-elements graphics^) ) (module a scheme (require 'draw-sig.ss 'big-draw.ss mzlib/unit) (provide-signature-elements draw^)) (require 'a) _________________________________________________ For list-related administrative tasks: http://list.cs.brown.edu/mailman/listinfo/plt-dev