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Make PngError non-exhaustive for forward compatibility

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This commit is contained in:
Josh Holmer 2018-07-14 15:45:25 -04:00
parent e1cf3bf54b
commit ebd94934a5
1 changed files with 5 additions and 0 deletions
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5
src/error.rs
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@ -1,10 +1,14 @@
use std::error::Error; use std::error::Error;
use std::fmt; use std::fmt;
// TODO: Use `#[non_exhaustive]` once stabilized
// https://github.com/rust-lang/rust/issues/44109
#[derive(Debug, Clone)] #[derive(Debug, Clone)]
pub enum PngError { pub enum PngError {
DeflatedDataTooLong(usize), DeflatedDataTooLong(usize),
Other(Box<str>), Other(Box<str>),
#[doc(hidden)]
_Nonexhaustive,
} }
impl Error for PngError { impl Error for PngError {
@ -20,6 +24,7 @@ impl fmt::Display for PngError {
match *self { match *self {
PngError::DeflatedDataTooLong(_) => f.write_str("deflated data too long"), PngError::DeflatedDataTooLong(_) => f.write_str("deflated data too long"),
PngError::Other(ref s) => f.write_str(s), PngError::Other(ref s) => f.write_str(s),
PngError::_Nonexhaustive => unreachable!(),
} }
} }
} }