Make managed_boxes feature gate error less opinionated

diff --git a/src/librustc/front/feature_gate.rs b/src/librustc/front/feature_gate.rs
index c17d6cabfed4f924f8f233e992a960596034eaca..c4337abb740927d3e7b46be3b6fb0f13a7b418e5 100644 (file)
--- a/src/librustc/front/feature_gate.rs
+++ b/src/librustc/front/feature_gate.rs
@@ -140,12 +140,12 @@ fn visit_ty(&mut self, t: &ast::Ty, _: ()) {
 
             },
             ast::ty_box(_) => {
-                self.gate_feature("managed_boxes", t.span, "The managed box syntax may be replaced \
-                                                            by a library type, and a garbage \
-                                                            collector is not yet implemented. \
-                                                            Consider using the `std::rc` module \
-                                                            as it performs much better as a \
-                                                            reference counting implementation.");
+                self.gate_feature("managed_boxes", t.span,
+                                  "The managed box syntax will be replaced \
+                                  by a library type, and a garbage \
+                                  collector is not yet implemented. \
+                                  Consider using the `std::rc::Rc` type \
+                                  for reference counted pointers.");
             }
             _ => {}
         }