freepascal.compiler/docs/syntax/fcall.syn

\begin{diagram}{Function calls}{functioncalls}
\begin{mysyntdiag}
\synt{function\ call}
\( 
\synt{function\ identifier} \\
\synt{method\ designator} \\
\synt{qualified\ method\ designator}\\
\synt{variable\ reference}
\)
\[
\synt{actual\ parameter\ list}
\]
\end{mysyntdiag}
\begin{mysyntdiag}
\synt{actual\ parameter\ list}
\lit* ( 
\[
\<[b] 
\synt{actual\ parameter} \\ 
\lit* , 
\> 
\]
\lit* )
\end{mysyntdiag}
\begin{mysyntdiag}
\synt{actual\ parameter} 
\( 
\synt{expression} \\ 
\synt{variable\ reference}
\)
\end{mysyntdiag}
\end{diagram}