[isabelle-dev] neg_numeral fallout

[Florian Haftmann]

> See now 376604d56b5

http://isabelle.in.tum.de/reports/Isabelle/rev/376604d56b54

The changeset is misleading since it describes »- 1« as special case of
a numeral, which it is not (any longer) – it is just the canonical
representation of minus one.

	Florian

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