Proposal: improve the Data.Tree API

[Johan Tibell]

On Fri, Feb 28, 2014 at 6:54 PM, Milan Straka <fox at ucw.cz> wrote:

> we are using mostly lookup in containers. Also lookup would be more
> consistent with Data.List.lookup (versus Data.List.find).
>

Also, when we use functions called find in containers it's for functions
that call 'error' on lookup failure.
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