rustc: Warn about dead constants

A few catch-all blocks ended up not having this case for constants.

Closes #17925

1 files changed, 3 insertions, 1 deletions

diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index 274bb2e39e0..be79b18bfe9 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -1334,6 +1334,7 @@ impl Item_ {
     pub fn descriptive_variant(&self) -> &str {
         match *self {
             ItemStatic(..) => "static item",
+            ItemConst(..) => "constant item",
             ItemFn(..) => "function",
             ItemMod(..) => "module",
             ItemForeignMod(..) => "foreign module",
@@ -1341,7 +1342,8 @@ impl Item_ {
             ItemEnum(..) => "enum",
             ItemStruct(..) => "struct",
             ItemTrait(..) => "trait",
-            _ => "item"
+            ItemMac(..) |
+            ItemImpl(..) => "item"
         }
     }
 }