Add debug

Author: native-api

test/conda.bats

@@ -52,7 +52,8 @@ OUT
   stub pyenv-exec "conda * : echo PYENV_VERSION=\${PYENV_VERSION} \"\$@\""
   stub pyenv-exec "python -s -m ensurepip : true"
 
-  run pyenv-virtualenv -p python3.5 venv
+  export PS4='+(${BASH_SOURCE}:${LINENO}): ${FUNCNAME[0]:+${FUNCNAME[0]}(): }'
+  PYENV_DEBUG=1 run pyenv-virtualenv -p python3.5 venv 2>&3
 
   assert_success
   assert_output <<OUT