When you attempt to tab complete a brew command an error is thrown

[Nocturnhabeo]

• Have you checked if problem occurs with fish 2.3.1?
• Tried fish without third-party customizations (check sh -c 'env HOME=$(mktemp -d) fish')?

fish version installed (fish --version): 2.3.1

OS/terminal used: OSX 10.11.6 El Capitan

When I try to tab complete brew install kali it fails with:
No matches for wildcard '$formuladir/.rb'.
/usr/local/Cellar/fish/2.3.1/share/fish/completions/brew.fish (line 3): ls $formuladir/.rb | sed 's/.rb$//' | sed "s|^$formuladir||"
^
in function '__fish_brew_formulae'
called on standard input

in command substitution
called on standard input

Reproduction steps

1. type brew install kali
2. hit tab

[Nocturnhabeo]

I can't get the error message the format correctly but the ^ is pointed to the $formuladir

[faho]

This should already be fixed by #3309.

[floam]

Homebrew should probably want to backport that change in master for their package. @Nocturnhabeo if you want to file an issue there this might get it fixed quicker for you (and others) on 2.3.1