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globset: make ErrorKind enum extensible

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This commit makes the ErrorKind enum extensible by adding a
__Nonexhaustive variant. Callers should use this as a hint that
exhaustive case analysis isn't possible in a stable way since new
variants may be added in the future without a semver bump.
This commit is contained in:
Andrew Gallant 2018-03-10 09:04:01 -05:00
parent e2516ed095
commit 54256515b4
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1 changed files with 9 additions and 0 deletions
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9
globset/src/lib.rs
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@ -163,6 +163,13 @@ pub enum ErrorKind {
DanglingEscape,
/// An error associated with parsing or compiling a regex.
Regex(String),
/// Hints that destructuring should not be exhaustive.
///
/// This enum may grow additional variants, so this makes sure clients
/// don't count on exhaustive matching. (Otherwise, adding a new variant
/// could break existing code.)
#[doc(hidden)]
__Nonexhaustive,
}
impl StdError for Error {
@ -210,6 +217,7 @@ impl ErrorKind {
"dangling '\\'"
}
ErrorKind::Regex(ref err) => err,
ErrorKind::__Nonexhaustive => unreachable!(),
}
}
}
@ -240,6 +248,7 @@ impl fmt::Display for ErrorKind {
ErrorKind::InvalidRange(s, e) => {
write!(f, "invalid range; '{}' > '{}'", s, e)
}
ErrorKind::__Nonexhaustive => unreachable!(),
}
}
}