[isabelle-dev] 'a ~=> 'b

Alexander Krauss krauss at in.tum.de
Tue Oct 5 11:57:40 CEST 2010

Dear all,

Is anyone especially attached to the (output) syntax "'a ~=> 'b" for "'a 
=> 'b option"? I regularly find it surprising when it suddenly comes up. 
For example, on page 47 of the tutorial (Excercise 3.4.6) it appears 
without an explanation (probably printed by a term antiquotation).

If nobody complains, I'll make this syntax input-only.


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