comment the `typeck-negative-impls-builtin` test

diff --git a/src/test/ui/traits/negative-impls/typeck-negative-impls-builtin.rs b/src/test/ui/traits/negative-impls/typeck-negative-impls-builtin.rs
index e326d3ab3f3cb705a0834a756346288cb28b93ce..474e0381799bda38e78848cd15b1400d05bec13a 100644 (file)
--- a/src/test/ui/traits/negative-impls/typeck-negative-impls-builtin.rs
+++ b/src/test/ui/traits/negative-impls/typeck-negative-impls-builtin.rs
@@ -1,3 +1,6 @@
+// A simple test that we are able to create negative impls, when the
+// feature gate is given.
+//
 // run-pass
 
 #![feature(negative_impls)]