@Janis, no, truth be told I didn't like it as I was writing it, but it also
didn't occur to me at the time to fire `where` down at the bottom like
that. Doing so would satisfy "intent first", but I'd say `let` and `where`
here would be tied in terms of "zig-zag annoyance", which is a natural
outcome of the pattern of needing a shared bound value across two guards.
The next evolution, avoiding the problem of nested `where`s entirely:
f tree =
case tree of
Leaf x -> munge a (b x)
Node s t -> munge a (c s t)
where
a = ...
b x = ...
c s t = ...
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