Janis, the following compiles for me: …
Right, where does not work for expressions, but for right-hand sides, of
which pattern match branches are an instance.
The next question would be, still under the assumption that a choice has to
be made between where and let because both won’t be made available at the
same time, how well “where-only” would work if in addition one wants to
have a local binding that spans all pattern match branches, i.e., something
one would currently write in Elm like so:
f tree =
let
a = ... something ...
in
case tree of
Leaf x -> let b = ... in ... using a and b ...
Node s t -> let c = ... in ... using a and c ...
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