You need to pass a tuple to the constructor, i.e.:
julia> x = Tuple{Int64}
Tuple{Int64} 
julia> x((1,)) 
(1,) 



On Friday, July 10, 2015 at 9:40:44 AM UTC-4, andrew cooke wrote:
>
>
> sorry, more confusion...  why doesn't this work?
>
> julia> Tuple{Int}(1)
> ERROR: MethodError: `convert` has no method matching convert(::Type{Tuple{
> Int64}}, ::Int64)
> This may have arisen from a call to the constructor Tuple{Int64}(...),
> since type constructors fall back to convert methods.
> Closest candidates are:
>   call{T}(::Type{T}, ::Any)
>   convert{T<:Tuple{Any,Vararg{Any}}}(::Type{T<:Tuple{Any,Vararg{Any}}}, ::
> T<:Tuple{Any,Vararg{Any}})
>   convert{T<:Tuple{Any,Vararg{Any}}}(::Type{T<:Tuple{Any,Vararg{Any}}}, ::
> Tuple{Any,Vararg{Any}})
>   ...
>  in call at essentials.jl:56
>
> this does:
>
> julia> immutable Tuple2{A,B}
>          a::A
>          b::B
>        end
>
> julia> Tuple2{Int,Int}(1,2)
> Tuple2{Int64,Int64}(1,2)
>
> and the docs at https://julia.readthedocs.org/en/latest/manual/types/ 
> seem to imply that's how Tuple should work too.
>
> thanks,
> andrew
>
>

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