Macro conch_runtime::impl_generic_builtin_cmd

macro_rules! impl_generic_builtin_cmd {
    (
        $(#[$cmd_attr:meta])*
        pub struct $Cmd:ident;

        $(#[$constructor_attr:meta])*
        pub fn $constructor:ident ();

        $(#[$spawned_future_attr:meta])*
        pub struct $SpawnedFuture:ident;

        $(#[$future_attr:meta])*
        pub struct $Future:ident;

        where T: $($t_bounds:path)+,
    ) => { ... };
    (
        $(#[$cmd_attr:meta])*
        pub struct $Cmd:ident;

        $(#[$constructor_attr:meta])*
        pub fn $constructor:ident ();

        $(#[$spawned_future_attr:meta])*
        pub struct $SpawnedFuture:ident;

        $(#[$future_attr:meta])*
        pub struct $Future:ident;

        where T: $($t_bounds:path)+,
              E: $($e_bounds:path),*,
    ) => { ... };
}