Merge pull request #39 from Marwes/unsafe_trait

feat: Parse unsafe traits and their impls

Author: dtolnay

src/parse.rs

@@ -18,7 +18,14 @@ pub enum Item {
 impl Parse for Item {
     fn parse(input: ParseStream) -> Result<Self> {
         let attrs = input.call(Attribute::parse_outer)?;
-        let lookahead = input.lookahead1();
+        let first_lookahead = input.lookahead1();
+        let lookahead = if first_lookahead.peek(Token![unsafe]) {
+            let ahead = input.fork();
+            ahead.parse::<Token![unsafe]>()?;
+            ahead.lookahead1()
+        } else {
+            first_lookahead
+        };
         if lookahead.peek(Token![pub]) || lookahead.peek(Token![trait]) {
             let mut item: ItemTrait = input.parse()?;
             item.attrs = attrs;

tests/test.rs

@@ -360,3 +360,16 @@ pub mod issue31 {
         }
     }
 }
+
+
+#[async_trait]
+pub unsafe trait UnsafeTrait { }
+
+#[async_trait]
+unsafe impl UnsafeTrait for () { }
+
+#[async_trait]
+pub(crate) unsafe trait UnsafeTraitPubCrate { }
+
+#[async_trait]
+unsafe trait UnsafeTraitPrivate { }