Description:

The fish built-in `type` function delegates to `/usr/bin/which` for finding system programs. It should be listed as an optional dependency for command lookups.

Steps to reproduce:
1. Install the fish package (any architecture).
2. Uninstall (if installed) the [which] package.
3. Open an interactive fish shell
4. execute `type grep` or `type <command>` where <command> is any system command in your PATH.
5. You should receive output along the following:
=============================================================================
/usr/share/fish/functions/type.fish (line 3): which $i ^/dev/null
^
in command substitution
called on line 120 of file “/usr/share/fish/functions/type.fish”,

in function “type”,
called on standard input,
with parameter list “-p command-not-found”

in function “__fish_command_not_found_setup”,
called on line 3 of file “/usr/share/fish/functions/type.fish”,
with parameter list “which”

in event handler: handler for generic event “fish_command_not_found”

/usr/share/fish/functions/type.fish (line 3): which gettext ^/dev/null
^
in command substitution
called on line 8 of file “/usr/share/fish/functions/type.fish”,

in . (source) call of file “/usr/share/fish/functions/_.fish”,
called on line 11 of file “/usr/share/fish/functions/type.fish”,

in command substitution
called on line 3 of file “/usr/share/fish/functions/type.fish”,

in command substitution
called on line 140 of file “/usr/share/fish/functions/type.fish”,

in function “type”,
called on standard input,
with parameter list “-p command-not-found”

in function “__fish_command_not_found_setup”,
called on line 3 of file “/usr/share/fish/functions/type.fish”,
with parameter list “which”

in event handler: handler for generic event “fish_command_not_found”

fish: Unknown command 'which'
/usr/share/fish/functions/type.fish (line 3): which $i ^/dev/null
^
in command substitution
called on line 120 of file “/usr/share/fish/functions/type.fish”,

in function “type”,
called on standard input,
with parameter list “which”

type: Could not find 'which'
=============================================================================