Feature/complex value#8

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tokers wants to merge 3 commits intomasterfrom

feature/complex_value

Commits on Aug 24, 2017

change: add some error logs
Alex Zhang
committed

Commits on Aug 25, 2017

improve: reference the value[i] rather than copy.
Alex Zhang
committed

Commits on Aug 27, 2017

feature: the print directive supports the complex value
Alex Zhang
committed