Optimize PartialEq impls for Ident
diff --git a/src/stable.rs b/src/stable.rs
index 30b8e77..935e86c 100644
--- a/src/stable.rs
+++ b/src/stable.rs
@@ -500,6 +500,26 @@
     }
 }
 
+impl PartialEq for Ident {
+    fn eq(&self, other: &Ident) -> bool {
+        self.sym == other.sym && self.raw == other.raw
+    }
+}
+
+impl<T> PartialEq<T> for Ident
+where
+    T: ?Sized + AsRef<str>,
+{
+    fn eq(&self, other: &T) -> bool {
+        let other = other.as_ref();
+        if self.raw {
+            other.starts_with("r#") && self.sym == other[2..]
+        } else {
+            self.sym == other
+        }
+    }
+}
+
 impl fmt::Display for Ident {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         if self.raw {