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//! Definitions used in derived implementations of [`core::convert`] traits.
use core::fmt;
/// Error returned by the derived [`TryInto`] implementation.
///
/// [`TryInto`]: macro@crate::TryInto
#[derive(Clone, Copy, Debug)]
pub struct TryIntoError<T> {
/// Original input value which failed to convert via the derived
/// [`TryInto`] implementation.
///
/// [`TryInto`]: macro@crate::TryInto
pub input: T,
variant_names: &'static str,
output_type: &'static str,
}
impl<T> TryIntoError<T> {
#[doc(hidden)]
#[must_use]
#[inline]
pub const fn new(
input: T,
variant_names: &'static str,
output_type: &'static str,
) -> Self {
Self {
input,
variant_names,
output_type,
}
}
}
impl<T> fmt::Display for TryIntoError<T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(
f,
"Only {} can be converted to {}",
self.variant_names, self.output_type,
)
}
}
#[cfg(feature = "std")]
impl<T: fmt::Debug> std::error::Error for TryIntoError<T> {}