Now why isn't pattern matching lazy by default? This seems odd
for a newbie since everything else is lazy by default.
It's even more confusing that pattern matching in 'let' _is_ lazy.
No, it's not.
See, in let or where constructs you don't have a choice; you can't do
different things depending on whether some value is Just x or
Nothing. Therefore, there is no need to perform pattern matching
strictly.
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