Multiple Assignment Workaround #19
Description
In previous versions of Crystal, Phase could do:
narr = NArray[[1, 2, 3], [4, 5, 6]]
a, b = narr # this becomes a = narr[0], b = narr[1], which are implicitly equivalent to a = narr[0, ..], b = narr[1, ..]
a # => NArray[1, 2, 3]
b # => NArray[4, 5, 6]Which was pretty handy!
In crystal PR #11545, multiple assignment was restricted to only allow Indexable on the RHS. I don't believe that MultiIndexable could possibly be turned into an instance of Indexable, as one-dimensionality is kind of baked into the interface.
I think that restricting the RHS to Indexable was a slight misnomer, for what it's worth - Indexable has a lot more baggage than just saying "this is a container". After exploring this some more, I might open an issue or PR on the crystal stdlib to work around this.
(Possibly a new module, e.g. MultiAssignable is needed that only requires unsafe_fetch and size to be defined, without forcing you to include dozens of 1d container methods?)