Added generic method syntax to language specification.

docs/language/dart.sty

 \def\keyword#1{\textbf{#1}}
 \def\builtinId#1{\textbf{#1}}
 \def\comment#1{\textit{#1}}
 \def\capt#1{\rmfamily \caption{#1}}
 \newcommand{\cd}[1]{\textsf{#1}}
 \def\lt{\ensuremath{<}}
 \def\gt{\ensuremath{>}}
 \def\<{\ensuremath{\langle}}
 \def\>{\ensuremath{\rangle}}
 \def\metavar#1{\ensuremath{\mathit{#1}}}
@@ skipping 66 matching lines @@
 %  \begin{verbatim}[#1]
   \def\@programcr{\@addfield\strut}
   \let\\=\@programcr
   \relax\@vobeyspaces\obeylines
 
   \sffamily
 }{
   %\end{verbatim}
 }
 
+% For grammar (both lexer and parser) symbols, used in text.
+\newcommand{\GrammarSymbol}[1]{{\bf{#1}}}
+
 % ----------------------------------------------------------------------
 % Support for hash valued Location Markers
 
 % very small font, to enable 40 char hash values in the margin
 \makeatletter
 \ifcase \@ptsize \relax% 10pt
   \newcommand{\miniscule}{\@setfontsize\miniscule{2}{3}}% \tiny: 5/6
 \or% 11pt
   \newcommand{\miniscule}{\@setfontsize\miniscule{3}{4}}% \tiny: 6/7
 \or% 12pt
   \newcommand{\miniscule}{\@setfontsize\miniscule{3}{4}}% \tiny: 6/7
 \fi
 \makeatother
 
 % white: location markers should not create visual noise
 \definecolor{LMdim}{gray}{1.0}
 
 % insert location marker showing hash value of following paragraph
 \newcommand{\LMHash}[1]{%
   \hspace{0pt}\marginpar{\raisebox{0.5ex}{\miniscule{\color{LMdim}#1}}}}
 
 % support convenient renewcommand
 \let\OriginalLMHash\LMHash
 
 % define a label, and show the associated logical location marker
 \newcommand{\LMLabel}[1]{%
   \vspace{-\baselineskip}\hspace{0pt}\OriginalLMHash{\raisebox{10ex}{#1}}%
   \label{#1}}
 % ----------------------------------------------------------------------