Updating tools from drscheme->drrracket involves two steps: 1) changing the tool to refer to drracket, and 2) changing the info.rkt file to refer to drracket-tools rather than tools.
Unfortunately, if you do #2 before #1, you get a real head-scratcher of an error message: define-unit-binding: unit argument expects an untagged import with signature drscheme:tool^, which this usage context does not supply The baffling thing about this is that drscheme:tool^ *is* the signature that this thing supplies. I took a look at the tool infrastructure, and there's some regexp-rewriting stuff that scared me. I conjecture that the (correct) error message is one that refers to the drracket:tool^ signature, but that it's getting rewritten into one that refers to drscheme:tool^. I'm not sure how many people are going to fall into this hole, but the error message here steers you in the wrong direction. John
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