
I interpreted the existing message as meaning "you don't pin a tap any more, rather you pin a specific formula from that tap". I.e. the command still worked, but it had to be done on a per-formula basis (eg. `brew tap-pin linuxbrew/xorg/mesa` instead of just `brew tap-pin linuxbrew/xorg`) IMO, this makes it clearer that the command itself is no longer supported.
Library
This directory contains all the code run by the official brew
and brew cask
commands in Homebrew
and all formulae (package descriptions) in taps (repositories containing formulae) in Taps
subdirectories.