Thanks for the detailed info. I was able to reproduce this. There seems to be some problem with importing modules without their swiftdoc in Ubuntu 14.04. I've filed https://bugs.swift.org/browse/SR-5800
> On 30-Aug-2017, at 1:26 PM, adelzh...@qq.com wrote: > > export SWIFT_HOME=/opt/swift/4.0-dev > export PATH="$SWIFT_HOME/usr/bin":"${PATH}" -- Ankit
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