Explicitly call parent constructor

[krlmlr]

for copy constructor, to avoid warning in -Wextra.

[codecov-io]

Codecov Report

Merging #670 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #670   +/-   ##
=======================================
  Coverage   92.91%   92.91%           
=======================================
  Files          65       65           
  Lines        3303     3303           
=======================================
  Hits         3069     3069           
  Misses        234      234

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[kevinushey]

LGTM

[eddelbuettel]

I turned a rev.dep on for a combination of #670 and #671 but it will run into the night.

[eddelbuettel]

And given the very recent change to #671 I just updated to that and restarted.

[eddelbuettel]

Reverse-depends check worked just fine, so merging this.