#[doc(hidden)]
#[macro_export]
macro_rules! count {
    () => { proc_macro_call_0!() };
    (!) => { proc_macro_call_1!() };
    (!!) => { proc_macro_call_2!() };
    (!!!) => { proc_macro_call_3!() };
    (!!!!) => { proc_macro_call_4!() };
    (!!!!!) => { proc_macro_call_5!() };
    (!!!!!!) => { proc_macro_call_6!() };
    (!!!!!!!) => { proc_macro_call_7!() };
    (!!!!!!!!) => { proc_macro_call_8!() };
    (!!!!!!!!!) => { proc_macro_call_9!() };
    (!!!!!!!!!!) => { proc_macro_call_10!() };
    (!!!!!!!!!!!) => { proc_macro_call_11!() };
    (!!!!!!!!!!!!) => { proc_macro_call_12!() };
    (!!!!!!!!!!!!!) => { proc_macro_call_13!() };
    (!!!!!!!!!!!!!!) => { proc_macro_call_14!() };
    (!!!!!!!!!!!!!!!) => { proc_macro_call_15!() };
    (!!!!!!!!!!!!!!!!) => { proc_macro_call_16!() };
    (!!!!!!!!!!!!!!!!!) => { proc_macro_call_17!() };
    (!!!!!!!!!!!!!!!!!!) => { proc_macro_call_18!() };
    (!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_19!() };
    (!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_20!() };
    (!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_21!() };
    (!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_22!() };
    (!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_23!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_24!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_25!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_26!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_27!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_28!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_29!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_30!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_31!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_32!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_33!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_34!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_35!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_36!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_37!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_38!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_39!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_40!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_41!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_42!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_43!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_44!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_45!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_46!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_47!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_48!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_49!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_50!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_51!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_52!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_53!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_54!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_55!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_56!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_57!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_58!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_59!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_60!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_61!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_62!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_63!() };
    (!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!) => { proc_macro_call_64!() };
    ($(!)+) => {
        compile_error! { "this macro does not support >64 nested macro invocations" }
    };
}