content: %include tex.fmt
  
  \begingroup
  \invisiblecomments
  \def\bropen{@{@}
  \def\brclos{@}@}
  %{
  %format bropen = "\bropen"
  %format brclose = "\brclos"
  \begin{code}
  dir(include)              -- include a file
  dir(format)               -- formatting directive for an identifer/operator
  dir(bropen)               -- begin of an @lhs2TeX@ group
  dir(brclose)              -- end of an @lhs2TeX@ group
  dir(^let^)                -- set a toggle
  dir(^if^)                 -- test a condition
  dir(^else^)               -- second part of conditional
  dir(elif)                 -- @else@ combined with @if@
  dir(endif)                -- end of a conditional
  dir(latency)              -- tweak alignment in \textbf{poly} style
  dir(separation)     ^^^   -- tweak alignment in \textbf{poly} style
  dir(align)                -- set alignment column in \textbf{math} style
  dir(options)              -- set options for call of external program
  dir(subst)                -- primitive formatting directive
  dir(file)                 -- set filename
  \end{code}
  %}
  \endgroup
  