auto merge of #15999 : Kimundi/rust/fix_folder, r=nikomatsakis

[rust.git] / src / librustc / front / feature_gate.rs

diff --git a/src/librustc/front/feature_gate.rs b/src/librustc/front/feature_gate.rs
index 8b92166388d8608aadec35fbca6e4934948c3794..99855c7345cb4e5269a35959944a4edc71e66389 100644 (file)
--- a/src/librustc/front/feature_gate.rs
+++ b/src/librustc/front/feature_gate.rs
@@ -67,6 +67,9 @@
     ("quad_precision_float", Removed),
 
     ("rustc_diagnostic_macros", Active),
+    ("unboxed_closures", Active),
+
+    // if you change this list without updating src/doc/rust.md, cmr will be sad
 
     // A temporary feature gate used to enable parser extensions needed
     // to bootstrap fix for #5723.
@@ -327,6 +330,12 @@ fn visit_expr(&mut self, e: &ast::Expr, _: ()) {
             ast::ExprUnary(ast::UnBox, _) => {
                 self.gate_box(e.span);
             }
+            ast::ExprUnboxedFn(..) => {
+                self.gate_feature("unboxed_closures",
+                                  e.span,
+                                  "unboxed closures are a work-in-progress \
+                                   feature with known bugs");
+            }
             _ => {}
         }
         visit::walk_expr(self, e, ());