diff --git a/src/librustc_typeck/diagnostics.rs b/src/librustc_typeck/diagnostics.rs
index 3037e8d4a16..1323997315e 100644
--- a/src/librustc_typeck/diagnostics.rs
+++ b/src/librustc_typeck/diagnostics.rs
@@ -4709,7 +4709,7 @@ register_diagnostics! {
            // between structures with the same definition
     E0521, // redundant default implementations of trait
     E0533, // `{}` does not name a unit variant, unit struct or a constant
-    E0563, // cannot determine a type for this `impl Trait`: {}
+//  E0563, // cannot determine a type for this `impl Trait`: {} // removed in 6383de15
     E0564, // only named lifetimes are allowed in `impl Trait`,
            // but `{}` was found in the type `{}`
     E0567, // auto traits can not have type parameters