Rollup merge of #42497 - qnighy:just-use-try-in-three-places, r=eddyb

Replace some matches with try.

This patch just replaces `match`es with `?` in the compiler, which I came across when I'm reading the parser.

2 files changed, 2 insertions, 8 deletions

diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index d9cb2b4ab7d..1e156ed07b0 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -1249,10 +1249,7 @@ impl<'a> Parser<'a> {
             let mac = respan(lo.to(self.prev_span), Mac_ { path: pth, tts: tts });
             (keywords::Invalid.ident(), ast::TraitItemKind::Macro(mac))
         } else {
-            let (constness, unsafety, abi) = match self.parse_fn_front_matter() {
-                Ok(cua) => cua,
-                Err(e) => return Err(e),
-            };
+            let (constness, unsafety, abi) = self.parse_fn_front_matter()?;
 
             let ident = self.parse_ident()?;
             let mut generics = self.parse_generics()?;
diff --git a/src/libsyntax/ptr.rs b/src/libsyntax/ptr.rs
index 15111bbba0a..d51ff9860ac 100644
--- a/src/libsyntax/ptr.rs
+++ b/src/libsyntax/ptr.rs
@@ -211,10 +211,7 @@ impl<T: Encodable> Encodable for P<[T]> {
 
 impl<T: Decodable> Decodable for P<[T]> {
     fn decode<D: Decoder>(d: &mut D) -> Result<P<[T]>, D::Error> {
-        Ok(P::from_vec(match Decodable::decode(d) {
-            Ok(t) => t,
-            Err(e) => return Err(e)
-        }))
+        Ok(P::from_vec(Decodable::decode(d)?))
     }
 }