htdp
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Add Debug button to #lang htdp/asl.
Fixes #177.
@rfindler This avoids the "two syntax-check buttons" problem.
This also makes https://github.com/racket/drracket/pull/592 obsolete.
This pull request has been mentioned on Racket Discourse. There might be relevant details there:
https://racket.discourse.group/t/racket-v8-16-draft-release-notes/3518/2