Remove `SymbolStr`.

By changing `as_str()` to take `&self` instead of `self`, we can just
return `&str`. We're still lying about lifetimes, but it's a smaller lie
than before, where `SymbolStr` contained a (fake) `&'static str`!

1 files changed, 1 insertions, 1 deletions

diff --git a/compiler/rustc_middle/src/middle/mod.rs b/compiler/rustc_middle/src/middle/mod.rs
index 80a54071311..fc35cafcc77 100644
--- a/compiler/rustc_middle/src/middle/mod.rs
+++ b/compiler/rustc_middle/src/middle/mod.rs
@@ -21,7 +21,7 @@ pub mod lib_features {
                 .map(|(f, s)| (*f, Some(*s)))
                 .chain(self.unstable.iter().map(|f| (*f, None)))
                 .collect();
-            all_features.sort_unstable_by_key(|f| f.0.as_str());
+            all_features.sort_unstable_by(|a, b| a.0.as_str().partial_cmp(b.0.as_str()).unwrap());
             all_features
         }
     }