$ 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

   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