The Crystal Programming Language Forum

TIL `Tuple#reduce` has limits

I was converting a bunch of arrays to tuples in an effort to remove a bunch of intermediate array allocations from stefanwille/crystal-redis (I was able to get about 13% improvement on throughput on Redis#incr with that change), and I discovered this beautiful compiler error:

a = {1, 2}
b = {3, 4}
c = {5, 6}

{a, b, c}.reduce(Tuple.new) do |result, tuple|
  result + tuple
end
The fun part of the error β€” trimmed because Discourse only allows posts to be 32KB πŸ˜‚

Error: instantiating '(Tuple() | Tuple(Int32, Int32) | Tuple(Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32) | Tuple(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32, Int32)

Turns out, because the type of the result block argument is all of the return types result + other could possibly return, it has to keep concatenating type lists recursively. It makes sense, but it was hilarious to discover. :joy:

Also, TIL tuples have a maximum size of 300, probably for this exact reason.

2 Likes

This is some wizardry

Yeah I actually ran into this with named tuples several months ago. Apparently the limit is put in place to keep LLVM bugs from happening or something. Imo we need a better solution, but that’s where we are.

The limit is there because otherwise that code above would stack overflow and it would be pretty hard to know what went wrong.

Also my advise has always been to avoid tuples and named tuples unless for simple use cases. Trying to use them as Array and Hash replacements (dynamic lengths) will only make your experience with Crystal more frustrating.