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cmdline.ss works in MzScheme but not in DrScheme Jr



Greetings,

In DrScheme v103.1 (taken from CVS around 2000-10-11T13:30Z, I
accidentally forgot to specify release-103 tag so if this
resolution is not enough, I'll update and compile again
release-103):

[foo] drscheme-jr -l 'Full Scheme (MzScheme)'
DrScheme Jr is loading. Please wait...
Welcome to DrScheme Jr version 103.1, Copyright (c) 1995-2000 PLT
Language: Textual Full Scheme (MzScheme)
> (require-library "cmdline.ss")
/usr/local/lib/plt/collects/mzlib/cmdlineu.ss: 4.1-5.31:
  begin-elaboration-time: exception at elaboration time:
  begin-elaboration-time: exception at elaboration time:
  begin-elaboration-time: exception at elaboration time: parsed-back:
  expects argument of type <struct:parsed>; given
  #&(#<struct:top-level-varref/bind/unit>
  #<struct:top-level-varref/bind/unit>
  #<struct:top-level-varref/bind/unit>
  #<struct:top-level-varref/bind/unit>
  #<struct:top-level-varref/bind/unit>) 

but

[foo] mzscheme
Welcome to MzScheme version 103.1, Copyright (c) 1995-2000 PLT (Matthew Flatt)
> (require-library "cmdline.ss")
>

I.e. cmdline.ss loads (and works too) fine in MzScheme but doesn't
even load in DrScheme Jr.

-- 
Hannu