[isabelle-dev] set_comprehension_pointfree simproc
traytel at in.tum.de
Fri Mar 14 14:03:55 CET 2014
Am 14.03.2014 13:36, schrieb Makarius:
> What is the status of the set_comprehension_pointfree simproc?
> In 31afce809794 Dmitriy says "set_comprehension_pointfree simproc
> causes to many surprises if enabled by default", and in 4d899933a51a
> I've tried to reconstruct the missing NEWS entry, since this is cleary
> a user-relevant change.
> Looking around in the sources and the history, e.g. 9979d64b8016 where
> Lukas Bulwahn is "moving simproc from Finite_Set to more appropriate
> Product_Type theory" shows that there is a related
> Set_Comprehension_Pointfree.code_simproc still present today
When working towards 31afce809794, I also tried deactivating this code
preprocessor, but it was used in some places outside of HOL-Main for
code generation (e.g. in HOL-IMP).
> Does anybody understand how the tool was initially intended to work?
> Is it feasible to move it just in one place? Lets say
> src/HOL/Library/Set_Comprehension_Pointfree.thy, so that the
> applications that need it can import just that theory, and main HOL
> remains clear.
Yes, that's a good idea. The is one usage of the simproc in HOL
(Relation.thy), but this should be easy to get rid of.
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