First of all I think that this proposal has a lot of merit. Since a lot of the discussion as been around clarity I feel that a lot of that could be addressed through formatting of the additions.
Compare these two versions for example:
for let {count, sum} = {0, 0}, i <- [1, 2, 3] do
sum = sum + i
count = count + 1
{i * 2, {sum, count}}
end
Or this:
for let {count, sum} = {0, 0},
i <- [1, 2, 3] do
sum = sum + i
count = count + 1
{i * 2, {sum, count}}
end
I feel like the latter addresses a lot of the clarity concerns and that style could be enforced through mix format.
As a final note, we a possible alternative to for let could be for with but that could have some connotation collisions with with. On the other hand it reads nicely.
for with {count, sum} = {0, 0},
i <- [1, 2, 3] do
sum = sum + i
count = count + 1
{i * 2, {sum, count}}
end
