1 files changed, 6 insertions, 0 deletions
diff --git a/src/libsyntax/ext/build.rs b/src/libsyntax/ext/build.rs
index 4d79ff3257a..4d3913da365 100644
--- a/src/libsyntax/ext/build.rs
+++ b/src/libsyntax/ext/build.rs
@@ -148,6 +148,8 @@ pub trait AstBuilder {
     fn expr_some(&self, sp: Span, expr: Gc<ast::Expr>) -> Gc<ast::Expr>;
     fn expr_none(&self, sp: Span) -> Gc<ast::Expr>;
 
+    fn expr_tuple(&self, sp: Span, exprs: Vec<Gc<ast::Expr>>) -> Gc<ast::Expr>;
+
     fn expr_fail(&self, span: Span, msg: InternedString) -> Gc<ast::Expr>;
     fn expr_unreachable(&self, span: Span) -> Gc<ast::Expr>;
 
@@ -674,6 +676,10 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
         self.expr_path(none)
     }
 
+    fn expr_tuple(&self, sp: Span, exprs: Vec<Gc<ast::Expr>>) -> Gc<ast::Expr> {
+        self.expr(sp, ast::ExprTup(exprs))
+    }
+
     fn expr_fail(&self, span: Span, msg: InternedString) -> Gc<ast::Expr> {
         let loc = self.codemap().lookup_char_pos(span.lo);
         self.expr_call_global(