zsh_completion: drop -w, add -S to _arguments From the docs: http://zsh.sourceforge.net/Doc/Release/Completion-System.html _arguments -w: "allow option stacking even if one or more of the options take arguments", so something like "-xy xarg yarg". Mercurial's command line parser doesn't support that, so the flag got removed in zsh 92584634d3d3 and bf8b61182043. _arguments -S: "do not complete options after a ‘--’ appearing on the line". By options it means things like "-x" and "--foo", but it will still complete arguments like files. Differential Revision: https://phab.mercurial-scm.org/D4262