--
constant nat.gcd : nat → nat → nat
namespace foo
 constant f : nat → nat
 constant g : nat → nat
end foo

namespace boo
 constant f : nat → nat
end boo

open foo boo

check ``f

check ``g

open nat

check ``add

check ``gcd

check `f
check `foo.f

namespace bla
section
  parameter A : Type
  definition ID : A → A := λ x, x

  check ``ID

end
end bla