\documentclass[12pt]{report}
\usepackage[utf8x]{inputenc}

%Warning: tipa declares many non-standard macros used by utf8x to
%interpret utf8 characters but extra packages might have to be added
%such as "textgreek" for Greek letters not already in tipa
%or "stmaryrd" for mathematical symbols.
%Utf8 codes missing a LaTeX interpretation can be defined by using
%\DeclareUnicodeCharacter{code}{interpretation}.
%Use coqdoc's option -p to add new packages or declarations.
\usepackage{tipa}

\usepackage[T1]{fontenc}
\usepackage{fullpage}
\usepackage{coqdoc}
\usepackage{amsmath,amssymb}
\usepackage{url}
\begin{document}
\coqlibrary{Coqdoc.Context}{Library }{Coqdoc.Context}

\begin{coqdoccode}
\coqdocnoindent
\coqdockw{Section} \coqdef{Coqdoc.Context.Sec}{Sec}{\coqdocsection{Sec}}.\coqdoceol
\coqdocnoindent
\coqdockw{Context} (\coqdef{Coqdoc.Context.Sec.foo}{foo}{\coqdocvariable{foo}} : \coqexternalref{nat}{http://coq.inria.fr/stdlib/Coq.Init.Datatypes}{\coqdocinductive{nat}}).\coqdoceol
\coqdocnoindent
\coqdockw{Check} \coqref{Coqdoc.Context.Sec.foo}{\coqdocvariable{foo}}.\coqdoceol
\coqdocnoindent
\coqdockw{End} \coqref{Coqdoc.Context.Sec}{\coqdocsection{Sec}}.\coqdoceol
\end{coqdoccode}
\end{document}
