[isabelle-dev] Reviving an old thread: [isabelle] structured induction: mutual definitions and "arbitrary" in inductions?
makarius at sketis.net
Wed Oct 12 16:01:52 CEST 2011
On Wed, 12 Oct 2011, Brian Huffman wrote:
> After implementing the warning, I dug through the revision history and
> was surprised to find that my "new" feature actually used to exist! It
> was removed in January 2006:
> I don't understand why the warning message was ever removed. The
> commit message "fix_tac: no warning" is unhelpful.
This needs some further investigation. My log message from 2006 is an
example of how not to do it -- just parroting the change without any
explanation. (2006 was a bad year in Isabelle development.)
Does your own change do anything different from the old version?
BTW, that one was originating from here:
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