blueyed rbenv-prefix: do not silence rbenv-which for system version
This suppressed any output when using RBENV_DEBUG=1 and does not really
hurt to have in the unlikely case that it should fail; you would get
two error messages now:

rbenv: ruby: command not found
rbenv: system version not found in PATH
Latest commit 806f3f6 Jul 13, 2018
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rbenv Better error message for `rbenv shell` Dec 7, 2017
rbenv---version rbenv 1.1.1 Jun 15, 2017
rbenv-commands Fix some issues reported by shellcheck Nov 29, 2017
rbenv-completions completions for rbenv-completions Nov 20, 2015
rbenv-exec Speed up obtaining `exec/which/whence` completions Oct 14, 2014
rbenv-global Remove support for legacy global version files Dec 29, 2015
rbenv-help Fix some issues reported by shellcheck Nov 29, 2017
rbenv-hooks Merge remote-tracking branch 'origin/master' into version-hooks Dec 23, 2015
rbenv-init Fixed `rbenv init -` output to work w/ no args and bash's `set -u`. Nov 6, 2017
rbenv-local Remove support for legacy version file Dec 29, 2015
rbenv-prefix rbenv-prefix: do not silence rbenv-which for system version Aug 6, 2018
rbenv-rehash Fix some issues reported by shellcheck Nov 29, 2017
rbenv-root Fix some issues reported by shellcheck Nov 29, 2017
rbenv-sh-rehash Avoid invoking `hash -r` in fish Oct 31, 2013
rbenv-sh-shell Conforms OLD_RBENV_VERSION to RBENV_* convention Dec 19, 2016
rbenv-shims tests galore Mar 7, 2013
rbenv-version Documentation tweaks Dec 30, 2012
rbenv-version-file Fix #1065 Feb 26, 2018
rbenv-version-file-read Remove ableist language Jun 5, 2018
rbenv-version-file-write Documentation tweaks Dec 30, 2012
rbenv-version-name Merge remote-tracking branch 'origin/master' into version-hooks Dec 23, 2015
rbenv-version-origin Ensure RBENV_VERSION_ORIGIN is not inherited from environment Dec 23, 2015
rbenv-versions Simplify reference to realpath.dylib within `rbenv-versions` Dec 24, 2015
rbenv-whence Fix some issues reported by shellcheck Nov 29, 2017
rbenv-which rbenv-which: change PATH only for the "command -v" lookup Jun 7, 2018