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Workaround an upstream nom bug

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This commit works around Geal/nom#843 where the API of the `nom` crate
changes based on feature selection, meaning we need to be compatible
even if another crate in the crate graph enables a feature.

Ideally this'd be fixed in upstream `nom`, and it looks like it will in
the next major version! For now a local catch-all directive should help
out.
This commit is contained in:
Alex Crichton 2019-03-12 12:22:24 -07:00
parent 90c3196b7b
commit 5192b95bf3
1 changed files with 9 additions and 2 deletions
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11
crates/webidl/src/lib.rs
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@ -68,10 +68,17 @@ fn parse(webidl_source: &str, allowed_types: Option<&[&str]>) -> Result<Program>
.context(ErrorKind::ParsingWebIDLSource)
.into(),
weedle::Err::Error(cx) | weedle::Err::Failure(cx) => {
// Note that #[allow] here is a workaround for Geal/nom#843
// because the `Context` type here comes from `nom` and if
// something else in our crate graph enables the
// `verbose-errors` feature then we need to still compiled
// against the changed enum definition.
#[allow(unreachable_patterns)]
let remaining = match cx {
weedle::Context::Code(remaining, _) => remaining,
weedle::Context::Code(remaining, _) => remaining.len(),
_ => 0,
};
let pos = webidl_source.len() - remaining.len();
let pos = webidl_source.len() - remaining;
format_err!("failed to parse WebIDL")
.context(ErrorKind::ParsingWebIDLSourcePos(pos))
.into()