$ hg init

  $ echo a > a

  $ hg ci -Ama

  adding a

  $ hg an a

  0: a

  $ echo "[ui]" >> $HGRCPATH

  $ echo "strict=True" >> $HGRCPATH

  $ hg an a

  hg: unknown command 'an'

  Mercurial Distributed SCM

  basic commands:

   add         add the specified files on the next commit

   annotate    show changeset information by line for each file

   clone       make a copy of an existing repository

   commit      commit the specified files or all outstanding changes

   diff        diff repository (or selected files)

   export      dump the header and diffs for one or more changesets

   forget      forget the specified files on the next commit

   init        create a new repository in the given directory

   log         show revision history of entire repository or files

   merge       merge working directory with another revision

   phase       set or show the current phase name

   pull        pull changes from the specified source

   push        push changes to the specified destination

   remove      remove the specified files on the next commit

   serve       start stand-alone webserver

   status      show changed files in the working directory

   summary     summarize working directory state

   update      update working directory (or switch revisions)

  use "hg help" for the full list of commands or "hg -v" for details

  [255]

  $ hg annotate a

  0: a

should succeed - up is an alias, not an abbreviation

  $ hg up

  0 files updated, 0 files merged, 0 files removed, 0 files unresolved