Add ergonomic_clones feature flag

compiler/rustc_feature/src/unstable.rs

@@ -473,6 +473,8 @@ declare_features! (
     (unstable, doc_masked, "1.21.0", Some(44027)),
     /// Allows `dyn* Trait` objects.
     (incomplete, dyn_star, "1.65.0", Some(102425)),
+    /// Allows the .use postfix syntax `x.use` and use closures `use |x| { ... }`
+    (unstable, ergonomic_clones, "CURRENT_RUSTC_VERSION", Some(132290)),
     /// Allows exhaustive pattern matching on types that contain uninhabited types.
     (unstable, exhaustive_patterns, "1.13.0", Some(51085)),
     /// Allows explicit tail calls via `become` expression.