Support Self used as expr inside trait method body

src/receiver.rs

@@ -19,6 +19,11 @@ pub fn has_self_in_block(block: &mut Block) -> bool {
 struct HasSelf(bool);
 
 impl VisitMut for HasSelf {
+    fn visit_expr_path_mut(&mut self, expr: &mut ExprPath) {
+        self.0 |= expr.path.segments[0].ident == "Self";
+        visit_mut::visit_expr_path_mut(self, expr);
+    }
+
     fn visit_type_path_mut(&mut self, ty: &mut TypePath) {
         self.0 |= ty.path.segments[0].ident == "Self";
         visit_mut::visit_type_path_mut(self, ty);

tests/test.rs

@@ -341,3 +341,22 @@ mod issue28 {
         async fn h(); // do not chain
     }
 }
+
+// https://github.com/dtolnay/async-trait/issues/31
+pub mod issue31 {
+    use async_trait::async_trait;
+
+    pub struct Struct<'a> {
+        pub name: &'a str,
+    }
+
+    #[async_trait]
+    pub trait Trait<'a> {
+        async fn hello(thing: Struct<'a>) -> String;
+        async fn hello_twice(one: Struct<'a>, two: Struct<'a>) -> String {
+            let str1 = Self::hello(one).await;
+            let str2 = Self::hello(two).await;
+            str1 + &str2
+        }
+    }
+}