On Sat, Sep 10, 2016 at 5:52 PM Kiki Sugiaman <ksugia...@gmail.com> wrote:

Question: can I determine whether f1 is nil given only f2 to check?

f2 is not (the untyped) nil. The thing inside f2 is possibly (a typed) nil.
For example: https://play.golang.org/p/E-It6kkgSw

-- 

-j

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