1 files changed, 8 insertions, 3 deletions
diff --git a/src/libsyntax/ext/build.rs b/src/libsyntax/ext/build.rs
index 9044cab05d6..61356507665 100644
--- a/src/libsyntax/ext/build.rs
+++ b/src/libsyntax/ext/build.rs
@@ -915,6 +915,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
                       fn_decl_span: Span) // span of the `|...|` part
                       -> P<ast::Expr> {
         self.expr(span, ast::ExprKind::Closure(ast::CaptureBy::Ref,
+                                               ast::IsAsync::NotAsync,
                                                ast::Movability::Movable,
                                                fn_decl,
                                                body,
@@ -935,6 +936,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
         // the entire lambda body. Probably we should extend the API
         // here, but that's not entirely clear.
         self.expr(span, ast::ExprKind::Closure(ast::CaptureBy::Ref,
+                                               ast::IsAsync::NotAsync,
                                                ast::Movability::Movable,
                                                fn_decl,
                                                body,
@@ -1008,9 +1010,12 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
                   name,
                   Vec::new(),
                   ast::ItemKind::Fn(self.fn_decl(inputs, ast::FunctionRetTy::Ty(output)),
-                              ast::Unsafety::Normal,
-                              dummy_spanned(ast::Constness::NotConst),
-                              Abi::Rust,
+                              ast::FnHeader {
+                                  unsafety: ast::Unsafety::Normal,
+                                  asyncness: ast::IsAsync::NotAsync,
+                                  constness: dummy_spanned(ast::Constness::NotConst),
+                                  abi: Abi::Rust,
+                              },
                               generics,
                               body))
     }