broadcasting and multiple values

[tpapp]

Sometimes it would be advantageous to broadcast functions which return multiple values, without creating intermediate arrays of tuples. Eg

f(x) = x, x+1
x = reshape(1:6,2,3)
@syntax_to_be_determined a, b = f.(x) # creating new arrays
a2 = similar(a)
b2 = similar(b)
a2, b2 .= f.(x) # in-place syntax is free, currently gives MethodError for broadcast!

so that

a == a2 == x
b == b2 == x.+1

would hold.

(short discussion in Discourse)

[TotalVerb]

#22129

[mbauman]

Let's close this as a dup of #22129 — I think that captures the same idea.