Tab completion causes ambiguity warning

[wbhart]

Tab completion causes an ambiguity warning for Main when two modules define the same symbol (intentionally).

This is an example of the behaviour (tab was pressed on the final line):

julia> module Bar1
          function foo()
             nothing
          end
          export foo
       end
Bar1

julia> module Bar2
          function foo()
             nothing
          end
          export foo
       end
Bar2

julia> using Bar1

julia> using Bar2

julia> Main.MWARNING: both Bar2 and Bar1 export "foo"; uses of it in module Main must be qualified

I have checked this happens with the latest nightly.

[wbhart]

This appears to be related to, or may even be the cause of #23677

[KristofferC]

Dup of #14787