Macro generate_proxy 

macro_rules! generate_proxy {
    (
        @generate_alias
        alias: $alias:ident,
        target_fn: $fname:ident,
        args: ( [ $( ($arg:ident : $arg_ty:ty) ),* ] ),
        ret: $ret:ty
    ) => { ... };
    (
        @recurse_aliases
        target_fn: $fname:ident,
        ret: $ret:ty,
        args_tt: $args_tt:tt,
        aliases: [ $($alias:ident),* ]
    ) => { ... };
    (
        @generate_main
        fn $fname:ident ( [ $( ($arg:ident : $arg_ty:ty) ),* ] ) -> $ret:ty;
        target_symbol: $real_sym:ident
    ) => { ... };
    (
        fn $fname:ident $args_tt:tt -> $ret:ty;
        name: $real_sym:ident
        $(, aliases: $($alias:ident),* )?
    ) => { ... };
}