Linklet Instantiation Error of the HtDP Plugin

[shhyou]

What version of Racket are you using?
v7.9.0.22 [cs]

What program did you run?

drracket with the following steps:

1. Turn off all plugins
2. Load only the HtDP plugin and nothing else
3. Restart DrRacket

If you got an error message, please include it here.

$ drracket
Error invoking tool #<path:<REPO>/racket/share/pkgs/htdp-lib/lang>;"htdp-langs.rkt"

instantiate-linklet: mismatch;
 reference to a variable that is uninitialized;
 possibly, bytecode file needs re-compile because dependencies changed
  name: sig-names
  exporting instance: "<REPO>/racket/collects/racket/private/unit-compiletime.rkt"
  importing instance: "<REPO>/racket/collects/racket/private/unit-utils.rkt"
  context...:
   body of "<REPO>/racket/collects/racket/private/unit-utils.rkt"
   .../racket/unit.rkt:996:20
   <REPO>/racket/share/pkgs/drracket/drracket/private/tools.rkt:318:4
   <REPO>/racket/share/pkgs/drracket/drracket/private/tools.rkt:72:0: load/invoke-all-tools
   .../racket/unit.rkt:996:20
   body of "<REPO>/racket/share/pkgs/drracket/drracket/tool-lib.rkt"
   body of "<REPO>/racket/share/pkgs/drracket/drracket/private/drracket-normal.rkt"
   body of "<REPO>/racket/share/pkgs/drracket/drracket/drracket.rkt"
instantiate-linklet: mismatch;
 reference to a variable that is uninitialized;
 possibly, bytecode file needs re-compile because dependencies changed
  name: check-duplicate-sigs
  exporting instance: "<REPO>/racket/collects/racket/private/unit-utils.rkt"
  importing instance: "<REPO>/racket/collects/racket/private/unit-contract.rkt"
  context...:
   body of "<REPO>/racket/collects/racket/private/unit-contract.rkt"
   <REPO>/racket/share/pkgs/drracket/drracket/private/tools.rkt:385:11
   <REPO>/racket/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:435:6
   <REPO>/racket/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:486:32
   <REPO>/racket/collects/racket/private/more-scheme.rkt:148:2: call-with-break-parameterization
   <REPO>/racket/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:370:11: eventspace-handler-thread-proc
instantiate-linklet: mismatch;
 reference to a variable that is uninitialized;
 possibly, bytecode file needs re-compile because dependencies changed
  name: unit/c/core
  exporting instance: "<REPO>/racket/collects/racket/private/unit-contract.rkt"
  importing instance: "<REPO>/racket/collects/racket/unit.rkt"
  context...:
   body of "<REPO>/racket/collects/racket/unit.rkt"
   <REPO>/racket/share/pkgs/drracket/drracket/private/tools.rkt:385:11
   <REPO>/racket/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:435:6
   <REPO>/racket/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:486:32
   <REPO>/racket/collects/racket/private/more-scheme.rkt:148:2: call-with-break-parameterization
   <REPO>/racket/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:370:11: eventspace-handler-thread-proc

Please include any other relevant details

1. If any of the following combination of plugins are also loaded, there won't be any error:
   • Algol 60 + HtDP
   • DeinProgramming DMdA + HtDP
   • DeinProgramming SDP + HtDP
2. raco setup doesn't change anything

[rfindler]

The commit racket/drracket@3a07fc0 is probably the bug, so I'll close this. But please reopen (or make a new PR) if you still see the problem.

And thanks!

[shhyou]

It's working for me too. Thank you!