Avoids feature blow-up when std==0.

4 jobs for small_fixe in 21 minutes and 46 seconds (queued for 8 seconds)
Status Job ID Name Coverage
  Build
passed #125511
docker
build_linux_27

00:18:42

passed #125512
docker
build_linux_36

00:18:41

passed #125513
macosx
build_macosx_27

00:21:46

passed #125514
macosx
build_macosx_36

00:21:01