Make sure you have checked all steps below.

Prerequisite

• Please consider implementing the feature as a hook script or plugin as a first step.
  • pyenv has some powerful support for plugins and hook scripts. Please refer to Authoring plugins for details and try to implement it as a plugin if possible.
• Please consider contributing the patch upstream to rbenv, since we have borrowed most of the code from that project.
  • We occasionally import the changes from rbenv. In general, you can expect changes made in rbenv will be imported to pyenv too, eventually.
  • Generally speaking, we prefer not to make changes in the core in order to keep compatibility with rbenv.
• My PR addresses the following pyenv issue (if any)
  • Closes Infinite loop when system python is a link to a pyenv shim #2696

Description

• Here are some details about my PR
  pyenv-which used to only delete $PYENV_ROOT/shims from PATH when looking for an executable for the system version.
  This PR makes a shim indicate to pyenv-exec that it's been called from an unusual location, ultimately causing pyenv-which to delete it from PATH as well.
  Moreover, pyenv-exec compiles a list envvar for "fake" executables for a given command, which prevents a loop even if there's more than one shim on PATH.

Tests

• My PR adds the following unit tests (if any)
  Tests for the new functionality