Temporarily remove the description for the diagnostic E0162

It turns out that adding new diagnostics is causing link failures
in runpass-full-deps tests. Further investigation pending.

Author: Jakub Wieczorek

src/librustc/diagnostics.rs

@@ -19,11 +19,6 @@ register_diagnostic!(E0001, r##"
     one is too specific or the ordering is incorrect.
 "##)
 
-register_diagnostic!(E0162, r##"
-    This error is produced by an `if let` expression where the pattern is irrefutable.
-    An `if let` that can never fail is considered an error.
-"##)
-
 register_diagnostics!(
     E0002,
     E0003,
@@ -156,5 +151,6 @@ register_diagnostics!(
     E0157,
     E0158,
     E0159,
-    E0161
+    E0161,
+    E0162
 )