Macro grx_body 

macro_rules! grx_body {
    (
        $text:literal
        $(,$($rest:tt)*)?
    ) => { ... };
    (
        $(#[$($anno:ident=$value:expr),+])?
        icon($name:literal)
        $([$($body:tt)+])?
        $(,$($rest:tt)*)?
    ) => { ... };
    (
        $(#[$($anno:ident=$value:expr),+])?
        $component_name:ident
        $( ($($args:tt)*) )?
        $([$($body:tt)+])?
        $(,$($rest:tt)*)?
    ) => { ... };
}