Suppress warning from g++ #62
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I got
```sh
ccache g++ -I/usr/share/R/include -DNDEBUG -I"/usr/local/lib/R/site-library/Rcpp/include" -fpic -g -O3 -Wall -pipe -march=native -c promise.cpp -o promise.o
promise.cpp: In function ‘std::vector<Rcpp::RObject_Impl<Rcpp::PreserveStorage> > explicitDots(Rcpp::Environment)’:
promise.cpp:73:31: warning: ‘el’ may be used uninitialized in this function [-Wmaybe-uninitialized]
out.push_back(makeExplicit(el));
~~~~~~~~~~~~^~~~
```
with g++-7.2, and the suggested change makes the warning go away:
ccache g++ -I/usr/share/R/include -DNDEBUG -I"/usr/local/lib/R/site-library/Rcpp/include" -fpic -g -O3 -Wall -pipe -march=native -c object_size.cpp -o object_size.o
ccache g++ -I/usr/share/R/include -DNDEBUG -I"/usr/local/lib/R/site-library/Rcpp/include" -fpic -g -O3 -Wall -pipe -march=native -c promise.cpp -o promise.o
ccache gcc -I/usr/share/R/include -DNDEBUG -I"/usr/local/lib/R/site-library/Rcpp/include" -fpic -g -O3 -Wall -pipe -std=gnu99 -march=native -c size-info.c -o size-info.o
ccache g++ -I/usr/share/R/include -DNDEBUG -I"/usr/local/lib/R/site-library/Rcpp/include" -fpic -g -O3 -Wall -pipe -march=native -c slice.cpp -o slice.o
```
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I got
with g++-7.2, and the suggested change makes the warning go away:
ccache g++ -I/usr/share/R/include -DNDEBUG -I"/usr/local/lib/R/site-library/Rcpp/include" -fpic -g -O3 -Wall -pipe -march=native -c object_size.cpp -o object_size.o
ccache g++ -I/usr/share/R/include -DNDEBUG -I"/usr/local/lib/R/site-library/Rcpp/include" -fpic -g -O3 -Wall -pipe -march=native -c promise.cpp -o promise.o
ccache gcc -I/usr/share/R/include -DNDEBUG -I"/usr/local/lib/R/site-library/Rcpp/include" -fpic -g -O3 -Wall -pipe -std=gnu99 -march=native -c size-info.c -o size-info.o
ccache g++ -I/usr/share/R/include -DNDEBUG -I"/usr/local/lib/R/site-library/Rcpp/include" -fpic -g -O3 -Wall -pipe -march=native -c slice.cpp -o slice.o