freepascal.compiler/docs/syntax/typeproc.syn

\begin{diagram}{Procedural types}{proceduraltypes}
\begin{mysyntdiag}
\synt{procedural\ type} 
\( \synt{function\ header} \\ 
   \synt{procedure\ header}
\)
\[ \lit*{of} \lit*{object} \]
\[ \lit* ; \synt{call\ modifiers} \] 
\end{mysyntdiag}
\begin{mysyntdiag}
\synt{function\ header} \lit*{function} \synt{formal\ parameter\ list}
\lit*: \synt{result\ type}
\end{mysyntdiag}
\begin{mysyntdiag}
\synt{procedure\ header} \lit*{procedure} \synt{formal\ parameter\ list}
\end{mysyntdiag}
\begin{mysyntdiag}
\synt{call\ modifiers} 
\( 
\lit*{register} \\
\lit*{cdecl}    \\
\lit*{pascal}   \\
\lit*{stdcall}  \\
\lit*{popstack}
\)
\end{mysyntdiag}
\end{diagram}