wilfred@Tenor ~/py-envs> . app-engine/bin/activate.fish 
fish: Unknown command “tempfile”
/home/wilfred/py-envs/app-engine/bin/activate.fish (line 1): tempfile
                                                             ^
in command substitution
    called on line 46 of file “/home/wilfred/py-envs/app-engine/bin/activate.fish”,

in . (source) call of file “/home/wilfred/py-envs/app-engine/bin/activate.fish”,
    called on standard input,

fish: Expected redirection specification, got token of type “$oldpromptfile”
/home/wilfred/py-envs/app-engine/bin/activate.fish (line 49):         echo "function _old_fish_prompt" >> $oldpromptfile
                                                                                                          ^
in . (source) call of file “/home/wilfred/py-envs/app-engine/bin/activate.fish”,
    called on standard input,

wilfred@Tenor ~/py-envs> fish --version
fish, version 1.23.1
wilfred@Tenor ~/py-envs> virtualenv --version
1.5.1