n0_error

Macro whatever

Source 
macro_rules! whatever {
    ($fmt:literal$(, $($arg:expr),* $(,)?)?) => { ... };
    ($source:expr, $fmt:literal$(, $($arg:expr),* $(,)?)*) => { ... };
}
Expand description

Propagates an error, adding formatted context.

  • whatever!("msg") returns Err(format_err!(...)).
  • whatever!(source, "msg {x}", x) unwraps source or returns with context.