updated the panic message wording
diff --git a/src/libstd/thread/local.rs b/src/libstd/thread/local.rs
index a2bbe37..e92c0d1 100644
--- a/src/libstd/thread/local.rs
+++ b/src/libstd/thread/local.rs
@@ -237,7 +237,7 @@
     pub fn with<F, R>(&'static self, f: F) -> R
                       where F: FnOnce(&T) -> R {
         self.try_with(f).expect("cannot access a Thread Local Storage value \
-                                 during or after it is destroyed")
+                                 during or after destruction")
     }
 
     /// Acquires a reference to the value in this TLS key.