[julia-users] Assigning variables in other modules vs. assigning to fields of types from other modules

[Brian Piper]

This seems unexpected to me:

module MyMod

type AType
    val
end

global a = AType(5.0)

global b = 10.0

end

Then in the REPL...

julia> MyMod.b = 7.6
ERROR: cannot assign variables in other modules

julia> MyMod.a.val = 4.5
4.5

So, in summation, no errors when assigning to fields of a composite type in 
another module, but an error with assigning to a variable in that module. 
Any insight as to what's going on here? Is this intended behavior, and if 
so, why?