symbol concatenation in a macro?

[Steven G. Johnson]

Simple question here, I just couldn't find it in the manual.

How do you concatenate symbols, e.g. make :ab from :a and :b? "*" works
for strings but not for symbols.

More specifically, I want to do this in a macro:

for f in (:a,:b,:c)
@eval begin
$(f) = ...
$(f * :_2) = ...
end
end

and have it define a, b, c and also a_2, b_2, and c_2.

Thanks!

[John Myles White]

One cheap way to do this is by converting to strings, doing concatenation, then converting to symbols again:

symbol(string(:a) * string(:b))

-- John

> --
>
>
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[Isaiah Norton]

Convoluted, but:

julia> for f in (:a,:b,:c)

         @eval begin

           $(f) = 111

           $(symbol(string(f, :_2))) = 222

         end

       end

--

[Steven G. Johnson]

I submitted a patch
https://github.com/JuliaLang/julia/pull/1818