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#![feature(trace_macros)] | |
trace_macros!(true); | |
macro_rules! wrap { | |
($n:expr) => (wrap!(S($n))) | |
} | |
macro_rules! wrap_nocrash { | |
($($n:tt)*) => (wrap_nocrash!(S($($n)*))) | |
} | |
macro_rules! nest2 { | |
($($n:tt)*) => (id!($($n)*)) | |
} | |
macro_rules! nest { | |
($n:expr) => (id_tt!($n)) | |
} | |
macro_rules! id { | |
($n:expr) => ($n) | |
} | |
macro_rules! id_tt { | |
($($n:tt)*) => (id!($($n)*)) | |
} | |
macro_rules! nest3 { | |
($n:expr) => (nest!(S($n))) | |
} | |
fn main() { | |
//wrap!(0); // Crashes | |
//wrap2!(0); // Doesn't crash | |
// nest! { S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(0))))))))))))))))))))))))) }; // Doesn't crash | |
nest! { S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(0)))))))))))))))))))))))))) }; | |
//nest3! { S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(0))))))))))))))))))))))))) }; | |
//id!{id! { S (S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(S(0)))))))))))))))))))))))))) ) }}; | |
} |
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