// SPDX-License-Identifier: CC0-1.0
/// Formats error.
///
/// If `std` feature is OFF appends error source (delimited by `: `). We do this because
/// `e.source()` is only available in std builds, without this macro the error source is lost for
/// no-std builds.
#[macro_export]
macro_rules! write_err {
($writer:expr, $string:literal $(, $args:expr)*; $source:expr) => {
{
#[cfg(feature = "std")]
{
let _ = &$source; // Prevents clippy warnings.
write!($writer, $string $(, $args)*)
}
#[cfg(not(feature = "std"))]
{
write!($writer, concat!($string, ": {}") $(, $args)*, $source)
}
}
}
}