[refactor] Combine brackets and within
#73
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This is targetted at #68.
After some preliminary refactorings to remove
Bwdin #72, I realizedbracketsandwithinwere 90% the same, but resisted my first attempts to combine them ;). Changing the contract onwithin(here renamedhelperand made local tobrackets) allowed this to proceed.Note the second commit makes explicit, using
Maybe....NonEmptyan invariant that in the first commit is just comments and incomplete-pattern-matches; you may prefer the first way though.