1 | //! Different variant error |
2 | |
3 | use core::fmt; |
4 | |
5 | /// An error type indicating that a [`TryFrom`](core::convert::TryFrom) call failed because the |
6 | /// original value was of a different variant. |
7 | #[derive (Debug, Clone, Copy, PartialEq, Eq)] |
8 | pub struct DifferentVariant; |
9 | |
10 | impl fmt::Display for DifferentVariant { |
11 | fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
12 | write!(f, "value was of a different variant than required" ) |
13 | } |
14 | } |
15 | |
16 | #[cfg (feature = "std" )] |
17 | impl std::error::Error for DifferentVariant {} |
18 | |
19 | impl From<DifferentVariant> for crate::Error { |
20 | fn from(err: DifferentVariant) -> Self { |
21 | Self::DifferentVariant(err) |
22 | } |
23 | } |
24 | |
25 | impl TryFrom<crate::Error> for DifferentVariant { |
26 | type Error = Self; |
27 | |
28 | fn try_from(err: crate::Error) -> Result<Self, Self::Error> { |
29 | match err { |
30 | crate::Error::DifferentVariant(err: DifferentVariant) => Ok(err), |
31 | _ => Err(Self), |
32 | } |
33 | } |
34 | } |
35 | |