[Haskell-cafe] strange stack overflow with Data.Map

[Tomasz Zielonka]

On Mon, Jan 02, 2006 at 05:28:39PM +0000, Adrian Hey wrote:
> BTW, I think I would prefer the default behaviour of insert
> to be to retain existing elements because this allows the
> optimisation of not updating the data structure representing
> the set at all (which should help keep heap burn rate down).

I hope you don't propose this for Map. It would break some nice uses,
like representing variable scopes in an interpreter. The "replacing"
insert allows you to easily implement hiding variables in outer
scopes.

Best regards
Tomasz

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