[julia-users] ++ as string concatenation operator

[Hans W Borchers]

I was interested to define "++" as operator for concatenating strings. I 
can define "+" for this purpose, but for "++" I get

    julia> function ++(x::String, y::String)
               x * y
           end
    ERROR: syntax: expected "(" in "function" definition

I looked up "//" in Rational.jl, but did not see the difference in how to 
define this operation.