List the feature in removed.rs

Author: Darksonn

Diff for: compiler/rustc_feature/src/removed.rs

@@ -244,6 +244,8 @@ declare_features! (
     /// Allows unnamed fields of struct and union type
     (removed, unnamed_fields, "1.83.0", Some(49804), Some("feature needs redesign")),
     (removed, unsafe_no_drop_flag, "1.0.0", None, None),
+    (removed, unsized_tuple_coercion, "CURRENT_RUSTC_VERSION", Some(42877),
+     Some("The feature restricts possible layouts for tuples, and this restriction is not worth it.")),
     /// Allows `union` fields that don't implement `Copy` as long as they don't have any drop glue.
     (removed, untagged_unions, "1.13.0", Some(55149),
      Some("unions with `Copy` and `ManuallyDrop` fields are stable; there is no intent to stabilize more")),

Diff for: compiler/rustc_span/src/symbol.rs

@@ -1,4 +1,5 @@
-//! An "interner" is a data structure that associates values with usize tags and allows bidirectional lookup; i.e., given a value, one can easily find the
+//! An "interner" is a data structure that associates values with usize tags and
+//! allows bidirectional lookup; i.e., given a value, one can easily find the
 //! type, and vice versa.
 
 use std::hash::{Hash, Hasher};
@@ -2164,6 +2165,7 @@ symbols! {
         unsized_const_params,
         unsized_fn_params,
         unsized_locals,
+        unsized_tuple_coercion,
         unstable,
         unstable_location_reason_default: "this crate is being loaded from the sysroot, an \
                           unstable location; did you mean to load this crate \