One other use for := that I have seen (although I'm not necessarily a fan
of this use) is to allow a function in a package to return a non-exported
typed object.
E.g.
--------
package foo
type hidden struct {...}
func FooProduce() *hidden {...}
func FooConsume(h *hidden){...}
----------
package main
....
x := FooProduce()
FooConsume(x)
-----------
There's no way to declare x without exporting its type. (Ignore the
simplistic case that could be reduced to FooConsume(FooProduce()) - there
are other reasons to store and pass around opaque types)
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