[isabelle-dev] Shadowing of theorem names in locales

Peter Lammich lammich at in.tum.de
Sun Oct 7 10:19:26 CEST 2012

The same may happen with constants, and I was already confused several
times, when the interpretation command failed due to this effect. Using
locale expressions and forgetting to add name prefixes (a!:, b!:, etc)
can easily cause this effect.

So I also vote for an error message (or at least a warning) that occurs
immediately when defining the locale or the constant/lemma inside a


On So, 2012-10-07 at 09:37 +0200, Florian Haftmann wrote:
> Hi all,
> currently, theorem names in locales can be shadowed (given that
> declarations are in different theories, otherwise the foundation level
> would reject the declaration since the two foundation theorems would
> have the same name).
> After some pondering I would argue that this should be forbidden:
> * (Complete) shadowing is a constant source of confusion.
> * Global interpretations are impossible then, since they would result in
> two global theorems with the same name.
> Any comments?
> Cheers,
> 	Florian
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