Well, m is not a global because of the let blog. Because you evaluate that
statement, m needs to be in the scope of the macro, which it is only for
msg (msg is global).
You probably don't want to eval in a macro, and just return an expression
instead. That's what macros do, take an expression and replace that
expression at compile time.
e.g.
macro example(var)
:(dump($var))
end
So this:
let m = "hola"
@example m
end
will be expanded at compile time to:
let m = "hola"
dump(m)
end
so they're in the same scope now.
You might find macroexpand useful: macroexpand(:( @mymacro my_expr)))
Am Samstag, 12. September 2015 23:45:23 UTC+2 schrieb Diego Javier Zea:
>
> I don't understand why am I getting this error? My macros can not find the
> variables inside *let* blocks. How Can I fix it? Thanks in advance
>
> julia> macro example(var)
> dump(var)
> @eval dump($var)
> end
>
> julia> msg = "hola"
> "hola"
>
> julia> @example msg
> Symbol msg
> ASCIIString "hola"
>
> julia> let m = "hola"
> @example m
> end
> Symbol m
> ERROR: UndefVarError: m not defined
> in eval_user_input at REPL.jl:64
> [inlined code] from REPL.jl:93
> in anonymous at task.jl:68
>
>
>
>
>
