Re: [julia-users] unicode character as type name leads to unexpected behavior

[Yichao Yu]

On Sat, Jun 13, 2015 at 2:02 PM, Kevin Owens <kevin.j.ow...@gmail.com> wrote:
> Maybe I just didn't read the documentation well enough, but when I try to
> use a unicode character as a name for a type it leads to unexpected
> behavior. I'm using Julia through Emacs and and ESS if that makes any
> difference.
>
> Here's the output from versioninfo()
>
> julia> versioninfo()
> Julia Version 0.3.9
> Commit 31efe69 (2015-05-30 11:24 UTC)
> Platform Info:
>   System: Linux (x86_64-unknown-linux-gnu)
>   CPU: Intel(R) Atom(TM) CPU N570   @ 1.66GHz
>   WORD_SIZE: 64
>   BLAS: libopenblas (DYNAMIC_ARCH NO_AFFINITY Atom)
>   LAPACK: libopenblas
>   LIBM: libm
>   LLVM: libLLVM-3.3
>
> and starting with a clean session in the REPL I see this happening:
>
>
>               _
>    _       _ _(_)_     |  A fresh approach to technical computing
>   (_)     | (_) (_)    |  Documentation: http://docs.julialang.org
>    _ _   _| |_  __ _   |  Type "help()" for help.
>   | | | | | | |/ _' |  |
>   | | |_| | | | (_| |  |  Version 0.3.9 (2015-05-30 11:24 UTC)
>  _/ |\__'_|_|_|\__'_|  |
> |__/                   |  x86_64-unknown-linux-gnu
>
> WARNING: Terminal not fully functional
> julia>
> julia> type delta
> +    x
> +    m
> end
>
> julia> type δ
> +    x
> +    m
> end
>
> julia> tmp1 = delta(.05,Inf)
> delta(0.05,Inf)
>
> julia> tmp2 = δ(.05,Inf)
> (0.05,Inf)
>
> julia> typeof(tmp1)
> delta (constructor with 1 method)
>
> julia> typeof(tmp2)
> (Float64,Float64)
>
> julia> abstract Something
>
> julia> type α <: Something
> +    x
> +    m
> end
> ERROR: syntax: invalid type signature
>
> I would have expected that using a unicode character would have the same
> behavior.
>
> If I put an inner constructer method in the definition of δ I get an error
>
> julia> type δ
> +    x
> +    m
>
> +    δ(x,m) = new(x,m)
> end
> ERROR: new not defined
>
> and as the error with α shows, you can't make it a subtype.

This appears to work for 0.4-dev on Linux...

julia> type delta
      x
      m
      end

julia> type δ
      x
      m
      end

julia> tmp1 = delta(0.05, Inf)
delta(0.05,Inf)

julia> tmp2 = δ(0.05, Inf)
δ(0.05,Inf)

julia> typeof(tmp1)
delta

julia> typeof(tmp2)
δ

julia> abstract Something

julia> type α <: Something
      x
      m
      end

julia> type γ
      x
      m
      γ(x, m) = new(x, m)
      end

julia> γ(1, 2)
γ(1,2)