Some people alias 'ls' so escape it in bash completion

Library/Contributions/brew_bash_completion.sh

@@ -12,7 +12,7 @@ _brew_to_completion()
         local actions="--cache --config --prefix cat cleanup configure create
             deps doctor edit home info install link list log outdated prune
             remove search unlink update uses"
-        local ext=$(ls $(brew --repository)/Library/Contributions/examples |
+        local ext=$(\ls $(brew --repository)/Library/Contributions/examples |
                     sed -e "s/\.rb//g" -e "s/brew-//g")
         COMPREPLY=( $(compgen -W "${actions} ${ext}" -- ${cur}) )
         return
@@ -29,14 +29,14 @@ _brew_to_completion()
     case "$prev" in
     # Commands that take a formula
     cat|deps|edit|fetch|home|homepage|info|install|log|options|uses)
-        local ff=$(ls $(brew --repository)/Library/Formula | sed "s/\.rb//g")
-        local af=$(ls $(brew --repository)/Library/Aliases 2> /dev/null | sed "s/\.rb//g")
+        local ff=$(\ls $(brew --repository)/Library/Formula | sed "s/\.rb//g")
+        local af=$(\ls $(brew --repository)/Library/Aliases 2> /dev/null | sed "s/\.rb//g")
         COMPREPLY=( $(compgen -W "${ff} ${af}" -- ${cur}) )
         return
         ;;
     # Commands that take an existing brew
     abv|cleanup|link|list|ln|ls|remove|rm|uninstall|unlink)
-        COMPREPLY=( $(compgen -W "$(ls $(brew --cellar))" -- ${cur}) )
+        COMPREPLY=( $(compgen -W "$(\ls $(brew --cellar))" -- ${cur}) )
         return
         ;;
     esac