1//! Invalid variant error
2
3use core::fmt;
4
5/// An error type indicating that a [`FromStr`](core::str::FromStr) call failed because the value
6/// was not a valid variant.
7#[derive(Debug, Clone, Copy, PartialEq, Eq)]
8pub struct InvalidVariant;
9
10impl fmt::Display for InvalidVariant {
11 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
12 write!(f, "value was not a valid variant")
13 }
14}
15
16#[cfg(feature = "std")]
17#[allow(clippy::std_instead_of_core)]
18impl std::error::Error for InvalidVariant {}
19
20impl From<InvalidVariant> for crate::Error {
21 fn from(err: InvalidVariant) -> Self {
22 Self::InvalidVariant(err)
23 }
24}
25
26impl TryFrom<crate::Error> for InvalidVariant {
27 type Error = crate::error::DifferentVariant;
28
29 fn try_from(err: crate::Error) -> Result<Self, Self::Error> {
30 match err {
31 crate::Error::InvalidVariant(err: InvalidVariant) => Ok(err),
32 _ => Err(crate::error::DifferentVariant),
33 }
34 }
35}
36