[julia-users] Segfault when defining generated method

[Darwin Darakananda]

Hi All,

I'm running into a problem where Julia is segfaulting when creating a 
generated method for an existing function.
This is the first time I'm using generated functions, so I'm not sure if 
I'm using it correctly.

function update!(x::Vector{Int}, Δxs::Vector{Int}...)
    for i in eachindex(x), Δx in Δxs
        x[i] += Δx[i]
    end
end


function update!(x::Vector{Float64}, Δxs::Vector{Float64}...)
    for i in eachindex(x), Δx in Δxs
        x[i] += 2.0*Δx[i]
    end
end


function update!(sys::Tuple, Δsys::Tuple)
    for (s, Δs) in zip(sys, Δsys)
        update!(s, Δs)
    end
end

# x = rand(Int, 100); Δx₁ = similar(x), Δx₁ = similar(x)
# y = rand(100); Δy₁ = similar(y), Δy₁ = similar(y)

# update!(x, Δx₁, Δx₂)
# update!(y, Δy₁, Δy₂)
# update!((x,y), (Δx₁, Δy₁))

# Want something to handle update!((x,y), (Δx₁, Δy₁), (Δx₂, Δy₂))

@generated function update!{N}(sys::Tuple, Δsys::Vararg{Tuple, N})
    # (Δs1, Δs2, ..., ΔsN)
    el  = [Symbol("Δs" * string(i)) for i in 1:N]
    # zip(Δsys[1], Δsys[2], ..., Δsys[N])
    src = Expr(:call, :zip, :sys, [Expr(:ref, :Δsys, i) for i in 1:N]...)

    quote
        for $(Expr(:tuple, :s, el...)) in $src
            # update!(s, Δs1, Δs2, ..., ΔsN)
            $(Expr(:call, :update!, :s, el...))
        end
        nothing
    end
end

signal (11): Segmentation fault
while loading no file, in expression starting on line 0
inst_tuple_w_ at /home/darwin/.local/julia/src/jltypes.c:2352
inst_type_w_ at /home/darwin/.local/julia/src/jltypes.c:2437
inst_tuple_w_ at /home/darwin/.local/julia/src/jltypes.c:2383
inst_type_w_ at /home/darwin/.local/julia/src/jltypes.c:2437
jl_instantiate_type_with at /home/darwin/.local/julia/src/jltypes.c:2480
jl_args_morespecific at /home/darwin/.local/julia/src/jltypes.c:3096
jl_typemap_list_insert_sorted at 
/home/darwin/.local/julia/src/typemap.c:1033
jl_typemap_insert_generic at /home/darwin/.local/julia/src/typemap.c:886
jl_typemap_insert at /home/darwin/.local/julia/src/typemap.c:1006
jl_method_table_insert at /home/darwin/.local/julia/src/gf.c:1069

⋮


It works fine if I change the name of the generated function to something 
else.  Is this the expected behavior?

Thanks,

Darwin