Async closures
diff --git a/tests/test_asyncness.rs b/tests/test_asyncness.rs
new file mode 100644
index 0000000..de9abfc
--- /dev/null
+++ b/tests/test_asyncness.rs
@@ -0,0 +1,70 @@
+// Copyright 2018 Syn Developers
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![cfg(all(feature = "extra-traits", feature = "full"))]
+
+extern crate proc_macro2;
+extern crate syn;
+
+use proc_macro2::Span;
+use syn::{Block, Expr, ExprBlock, ExprClosure, FnDecl, Ident, ItemFn, ReturnType, Visibility};
+use syn::punctuated::Punctuated;
+
+#[test]
+fn test_async_fn() {
+ let raw = "async fn process() {}";
+
+ let expected = ItemFn {
+ attrs: vec![],
+ vis: Visibility::Inherited,
+ constness: None,
+ unsafety: None,
+ asyncness: Some(Default::default()),
+ abi: None,
+ ident: Ident::new("process", Span::call_site()),
+ decl: Box::new(FnDecl {
+ fn_token: Default::default(),
+ generics: Default::default(),
+ paren_token: Default::default(),
+ inputs: Punctuated::new(),
+ variadic: None,
+ output: ReturnType::Default,
+ }),
+ block: Box::new(Block {
+ brace_token: Default::default(),
+ stmts: vec![],
+ }),
+ };
+
+ assert_eq!(expected, syn::parse_str(raw).unwrap());
+}
+
+#[test]
+fn test_async_closure() {
+ let raw = "async || {}";
+
+ let expected = Expr::Closure(ExprClosure {
+ attrs: vec![],
+ movability: None,
+ asyncness: Some(Default::default()),
+ capture: None,
+ or1_token: Default::default(),
+ inputs: Punctuated::new(),
+ or2_token:Default::default(),
+ output: ReturnType::Default,
+ body: Box::new(Expr::Block(ExprBlock {
+ attrs: vec![],
+ block: Block {
+ brace_token: Default::default(),
+ stmts: vec![],
+ }
+ })),
+ });
+
+ assert_eq!(expected, syn::parse_str(raw).unwrap());
+}