Macro reproto_backend_doc::html

macro_rules! html {
    (@open $out:ident, $element:ident {$($key:ident => $value:expr),*}) => { ... };
    (@close $out:ident, $element:ident) => { ... };
    ($out:ident, $element:ident {$($key:ident => $value:expr),*} => $body:block) => { ... };
    ($out:ident, $element:ident {$($key:ident => $value:expr),*} ~ $body:expr) => { ... };
    ($out:ident, $element:ident {$($key:ident => $value:expr),*}) => { ... };
    ($out:ident, $element:ident $body:expr) => { ... };
}