Expr -> Symbol MethodError when combining mapslices and reshapes about tensorcast.jl HOT 1 OPEN

I think it's not meant to work, but should have a friendlier error. A simpler example which does:

julia> using TensorCast

julia> slices = eachcol(rand(12, 12));

julia> size(@cast _[a,b,c] := slices[(a,b)][c]  a in 1:3)
(3, 4, 12)

julia> size(@cast _[a,b,c] := slices[a][(b,c)]  b in 1:3)
ERROR: LoadError: can't tensor product inner indices
    @cast _[a, b, c] := (slices[a])[(b, c)]  b in 1:3
    @ Main REPL[62]:1

The reason (if I remember right) is that reshape comes before stack in its list of possible operations. I don't think there's a strong reason it couldn't allow this, allow two different reshapes, except a bit more complexity.

from tensorcast.jl.