Warning when updating Iterators.jl

[ararslan]

               _
   _       _ _(_)_     |  A fresh approach to technical computing
  (_)     | (_) (_)    |  Documentation: https://docs.julialang.org
   _ _   _| |_  __ _   |  Type "?help" for help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 0.6.0-pre.beta.353 (2017-04-26 22:37 UTC)
 _/ |\__'_|_|_|\__'_|  |  Commit 09299516b5* (0 days old master)
|__/                   |  x86_64-apple-darwin15.6.0

julia> Pkg.update()
INFO: Updating METADATA...
INFO: Updating cache of DataFrames...
INFO: Updating cache of Compose...
INFO: Updating cache of Iterators...
INFO: Updating cache of StaticArrays...
INFO: Updating cache of Interpolations...
INFO: Updating cache of DataFrames...
INFO: Computing changes...
INFO: Upgrading Compose: v0.5.0 => v0.5.1
INFO: Upgrading Interpolations: v0.5.0 => v0.6.0
INFO: Upgrading Iterators: v0.3.0 => v0.3.1
INFO: Upgrading StaticArrays: v0.4.0 => v0.5.0
WARNING: The following packages have been updated but were already imported:
- Iterators
Restart Julia to use the updated versions.

So I guess whenever the Iterators.jl package is updated, a warning is issued because the Base Iterators module is available. It would be great if this could not happen.

[vchuravy]

julia/base/pkg/entry.jl

Line 544 in 0929951

if isdefined(Main, pkgsym) && isa(getfield(Main, pkgsym), Module)

needs the same fix as #21539