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/// Exits a function early with an `Error`. #[macro_export] macro_rules! bail { ($($arg:tt)*) => { return Err($crate::format_err!($($arg)*).into()); }; } /// Exits a function early with an `Error` if the condition is not satisfied. #[macro_export] macro_rules! ensure { ($cond:expr, $($arg:tt)*) => { if !($cond) { return Err($crate::format_err!($($arg)*).into()); } }; } /// Creates an `Error` using the standard string interpolation syntax. #[macro_export] macro_rules! format_err { ($($arg:tt)*) => { $crate::err_msg(format_args!($($arg)*)) }; }