Fix #7

[melonedo]

I am not sure whether extra care should be taken when we allow Expr(:quot) to be recursed into, but this fixes the issue.

[c42f]

Thanks!

Yes this does require extra care — you need to track whether you're inside a quoted section of the AST or inside an interpolation (inside a $) as part of the recursive expansion. Otherwise the following incorrect result will occur

julia> @_ map(:(_ + 1), 1:4)
4-element Vector{Expr}:
 :(_1 + 1)
 :(_1 + 1)
 :(_1 + 1)
 :(_1 + 1)

The additional tricky aspect is that this may be arbitrarily nested. For example, we should have:

julia> @_ map(:($(_ + :(_+2)) + _), 1:4)
4-element Vector{Expr}:
 :((1 + :(_ + 2)) + _)
 :((2 + :(_ + 2)) + _)
 :((3 + :(_ + 2)) + _)
 :((4 + :(_ + 2)) + _)

[c42f]

I don't think this should be removed — it currently ignores Expr(:meta, ...) which it should continue doing (and Expr(:inert) I guess... though :meta and particularly :inert are quite obscure!)