[isabelle-dev] cs. 39fe503602fb

[Florian Haftmann]

When having a look at

http://isabelle.in.tum.de/repos/isabelle/rev/39fe503602fb

it came to my mind that this might be implemented more generally, e.g.

the_aux :: 'a list => 'a
the_aux [x] = x

the :: 'a list => 'a
the xs = the_aux (remdups xs)

which would yield a Match exception without any low-level tinkering.

(of course, the situation is more complicated with enum and such, but
this example illustrated the principle: native pattern match failure to
express non-uniqueness).

	Florian


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