When encountering an undefined named lifetime, point to where it can be

This doesn't mention that using an existing lifetime is possible, but
that would hopefully be clear as always being an option. The intention
of this is to teach newcomers what the lifetime syntax is.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/librustc_resolve/lib.rs b/src/librustc_resolve/lib.rs
index 60a0049f5da..29872be47c2 100644
--- a/src/librustc_resolve/lib.rs
+++ b/src/librustc_resolve/lib.rs
@@ -11,6 +11,7 @@
 #![feature(crate_visibility_modifier)]
 #![feature(label_break_value)]
 #![feature(nll)]
+#![feature(slice_patterns)]
 #![recursion_limit = "256"]
 
 pub use rustc_hir::def::{Namespace, PerNS};