[isabelle-dev] [isabelle] match_tac, schematic and bound variables

Makarius makarius at sketis.net
Mon Aug 19 22:55:00 CEST 2013

On Sun, 18 Aug 2013, Lars Noschinski wrote:

>> Combinators like Subgoal.FOCUS have replaced a lot of old-style 
>> tinkering with goals; within the focused parts things are fixed and 
>> don't get instantiated by accident.
> I seem to remember a discussion on the mailing list that Subgoal.FOCUS 
> does not export schematic type variables. So this would give us another 
> not-quite correct match implementation.

I still have this on my list to look after it in further detail, but as 
far as I can tell it was about situations that are conceptially not 
allowed anyway: schematic type variables within fixed-term variables. 
The inference kernel happens to allow that in primitive rules, but almost 
everything will break down.  Type-inference is part of the syntactic 
phase, and needs to be finished before doing the actual logical 


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