Turn on warning for use of deprecated lint names

Author: aturon

src/librustc/lint/context.rs

@@ -261,14 +261,12 @@ impl LintStore {
         match self.by_name.find_equiv(&lint_name) {
             Some(&Id(lint_id)) => Some(lint_id),
             Some(&Renamed(ref new_name, lint_id)) => {
-                // NOTE(stage0): add the following code after the next snapshot
-
-                // let warning = format!("lint {} has been renamed to {}",
-                //                       lint_name, new_name);
-                // match span {
-                //     Some(span) => sess.span_warn(span, warning.as_slice()),
-                //     None => sess.warn(warning.as_slice()),
-                // };
+                let warning = format!("lint {} has been renamed to {}",
+                                      lint_name, new_name);
+                match span {
+                    Some(span) => sess.span_warn(span, warning.as_slice()),
+                    None => sess.warn(warning.as_slice()),
+                };
                 Some(lint_id)
             }
             None => None