Macro route::route_fn

macro_rules! route_fn {
    ( $f:ident -> $o:ident {
        $( $m:tt => $handle:expr , )*
    }, $def:path ) => { ... };
    ( $f:ident -> $o:ident {
        $( $m:tt => $handle:expr ), *    // missing trailing comma
    }, $def:path ) => { ... };
}