weird behavior with macro inside a module

[mlubin]

module Foo
export @bob1

macro bob1(expr)
    :(1+$expr)
end
end

macro bob2(expr)
    :(1+$expr)
end

using Foo
println(@bob2(1)) # works
println(@bob1(1)) # doesn't work

prints:

2
in @bob1: expr not defined
...

I might be doing something wrong, but not sure why this doesn't work.

[mlubin]

Obrigado a @tautologico, this is fixed if you add using Base. The complaint is about Base.expr.

[pao]

Why isn't using Base implicit by default, again?

[mlubin]

Good question

[pao]

Opened #1522 to discuss that follow-up.

[toivoh]

@JeffBezanson: Is there a reason to have AST interpolation refer to expr in the current scope and not Base.expr?
Unlike e.g. ref, I have a hard time seeing when someone would want to overload expr to change that behavior.
(I guess the same goes for tuple and e.g. (1,2))