fish doesn't have builtin command equivalent to bash's `hash -r`.

libexec/pyenv-fish-rehash

@@ -1,14 +0,0 @@
-#!/usr/bin/env bash
-set -e
-[ -n "$PYENV_DEBUG" ] && set -x
-
-# Provide pyenv completions
-if [ "$1" = "--complete" ]; then
-  exec pyenv-rehash --complete
-fi
-
-# When pyenv shell integration is enabled, delegate to pyenv-rehash,
-# then tell the shell to empty its command lookup cache.
-pyenv-rehash
-# FIXME: support fish
-#echo "hash -r"