Couple of questions about constant lookups

[Chris Roos]

I asked something along these lines recently (subject: "const_defined?
not quite in sync with const_get ??"). I don't think this exact case
was addressed in that mail but I apologise if it was..

I'm wondering why the last two lines in the code snippet below result
in different output.

-- code --

module Foo; end
class Bar; end

p Foo::Array #=> NameError: uninitialized constant Foo::Array
p Bar::Array #=> warning: toplevel constant Array referenced by Bar::Array

-- /code --

Cheers,

Chris