Tuples can be indexed multidimensionally... kind of

[ararslan]

Take a tuple, any old tuple, say (1,). Now try to getindex it with as many indices as you'd like.

julia> (1,)[]  # 0 indices
ERROR: StackOverflowError:
Stacktrace:
 [1] getindex(::Tuple{Int64}) at ./multidimensional.jl:0
 [2] getindex(::Tuple{Int64}) at ./multidimensional.jl:387 (repeats 79999 times)

julia> (1,)[1]  # 1 index
1

julia> (1,)[1,1]  # 2 indices
ERROR: StackOverflowError:
Stacktrace:
 [1] getindex(::Tuple{Int64}, ::Int64, ::Int64) at ./multidimensional.jl:0
 [2] getindex(::Tuple{Int64}, ::Int64, ::Int64) at ./multidimensional.jl:387 (repeats 79999 times)

The offending definition is here, reproduced below:

getindex(t::Tuple, I...) = getindex(t, IteratorsMD.flatten(I)...)

It's pretty clear that this method will recurse infinitely since the only more specific getindex method for tuples is getindex(::Tuple, ::Integer).

Tuples aren't really multidimensional objects, so it'd probably be best to stick with the one method.

[StefanKarpinski]

Removing non-linear indexing of tuples seems like a no-brainer to me, especially since it's currently too broken for it to actually be used anywhere.