\begin{frame}[fragile]
  \frametitle{Deep Dive into Parsing DSL Syntax}

  \begin{columns}
    \begin{column}{0.3\textwidth}
      \begin{itemize}
        \item Hand-rolled recursive-descent parser.
        \item Why not use LR parser generator?
      \end{itemize}
    \end{column}
    \begin{column}{0.55\textwidth}
      \begin{verbatim}
component HelloWorld {
    model {
        name: String = "hello",
    }

    view {
        <input bind:value="name" />
        "Hello, " {name} "!"
    }
}
      \end{verbatim}
    \end{column}
  \end{columns}
\end{frame}

\begin{frame}[fragile]
  \frametitle{Taking advantage of Rust syntax}

  \begin{columns}
    \begin{column}{0.4\textwidth}
      \begin{verbatim}
// proc-macro library
pub enum TokenTree {
    Group(Group),
    Ident(Ident),
    Punct(Punct),
    Literal(Literal),
}
      \end{verbatim}
    \end{column}
    \begin{column}{0.4\textwidth}
      \begin{itemize}
        \item Get \texttt{\{\}}-bracketed groups for free.
        \item Easily tell identifiers from strings.
        \item Punctuation has flexible representation.
        \item Get literal parsing for free.
      \end{itemize}
    \end{column}
  \end{columns}
\end{frame}