bjoernager/rust
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Switch out another use of do catch

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Scott McMurray 2018-08-19 17:51:02 -07:00
parent e4280852ae
commit 0095471417
2 changed files with 10 additions and 2 deletions
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10
src/libsyntax/parse/parser.rs
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@ -1756,9 +1756,17 @@ impl<'a> Parser<'a> {
let parser_snapshot_before_pat = self.clone();
// Once we can use edition 2018 in the compiler,
// replace this with real try blocks.
macro_rules! try_block {
($($inside:tt)*) => (
(||{ ::std::ops::Try::from_ok({ $($inside)* }) })()
)
}
// We're going to try parsing the argument as a pattern (even though it's not
// allowed). This way we can provide better errors to the user.
let pat_arg: PResult<'a, _> = do catch {
let pat_arg: PResult<'a, _> = try_block! {
let pat = self.parse_pat()?;
self.expect(&token::Colon)?;
(pat, self.parse_ty()?)