[isabelle-dev] Fwd: [isabelle] Problem with frule_tac substitution

[Tobias Nipkow]

I don't mind one way or the other, but also wonder if it is worth it - I
will certainly not rush in to change it.

Tobias

Lawrence Paulson schrieb:
> Obviously this proposal would involve a significant incompatibility. It may not even be very relevant any more, as this sort of instantiation is rather out of fashion. But it is worth a discussion.
> Larry
> 
> Begin forwarded message:
> 
>> I would propose to simplify the parsing rules to work like this: Any
>> variable name with index 0 can be referred to without a question mark
>> or dot, and a dot is always required for indices other than 0.
>>
>> x, ?x and ?x.0 parse as ("x", 0)
>> x0, ?x0 and ?x0.0 parse as ("x0", 0)
>> x2, ?x2 and ?x2.0 parse as ("x2", 0)
>> ?x.2 parses as ("x", 2)
> 
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