Rename feature gate

compiler/rustc_feature/src/unstable.rs

@@ -534,7 +534,7 @@ declare_features! (
     /// Allows the `#[must_not_suspend]` attribute.
     (unstable, must_not_suspend, "1.57.0", Some(83310)),
     /// Make `mut` not reset the binding mode on edition >= 2024.
-    (unstable, mut_dont_reset_binding_mode_2024, "CURRENT_RUSTC_VERSION", Some(123076)),
+    (unstable, mut_preserve_binding_mode_2024, "CURRENT_RUSTC_VERSION", Some(123076)),
     /// Allows `mut ref` and `mut ref mut` identifier patterns.
     (incomplete, mut_ref, "CURRENT_RUSTC_VERSION", Some(123076)),
     /// Allows using `#[naked]` on functions.

compiler/rustc_hir_typeck/src/pat.rs

@@ -636,7 +636,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         let bm = match ba {
             BindingAnnotation(ByRef::No, Mutability::Mut)
                 if !(pat.span.at_least_rust_2024()
-                    && self.tcx.features().mut_dont_reset_binding_mode_2024)
+                    && self.tcx.features().mut_preserve_binding_mode_2024)
                     && matches!(def_br, ByRef::Yes(_)) =>
             {
                 // `mut x` resets the binding mode in edition <= 2021.

compiler/rustc_lint_defs/src/builtin.rs

@@ -1656,7 +1656,7 @@ declare_lint! {
     pub DEREFERENCING_MUT_BINDING,
     Allow,
     "detects `mut x` bindings that change the type of `x`",
-    @feature_gate = sym::mut_dont_reset_binding_mode_2024;
+    @feature_gate = sym::mut_preserve_binding_mode_2024;
     // FIXME uncomment below upon stabilization
     /*@future_incompatible = FutureIncompatibleInfo {
         reason: FutureIncompatibilityReason::EditionSemanticsChange(Edition::Edition2024),

compiler/rustc_span/src/symbol.rs

@@ -1194,7 +1194,7 @@ symbols! {
         multiple_supertrait_upcastable,
         must_not_suspend,
         must_use,
-        mut_dont_reset_binding_mode_2024,
+        mut_preserve_binding_mode_2024,
         mut_ref,
         naked,
         naked_functions,

tests/ui/pattern/feature-gate-mut_preserve_binding_mode_2024.stderr

@@ -1,5 +1,5 @@
 error[E0308]: mismatched types
-  --> $DIR/feature-gate-mut_dont_reset_binding_mode_2024.rs:8:9
+  --> $DIR/feature-gate-mut_preserve_binding_mode_2024.rs:8:9
    |
 LL |     let Foo(mut a) = &Foo(0);
    |             ----- expected due to the type of this binding
@@ -13,7 +13,7 @@ LL +     a = 42;
    |
 
 error[E0308]: mismatched types
-  --> $DIR/feature-gate-mut_dont_reset_binding_mode_2024.rs:12:9
+  --> $DIR/feature-gate-mut_preserve_binding_mode_2024.rs:12:9
    |
 LL |     let Foo(mut a) = &mut Foo(0);
    |             ----- expected due to the type of this binding

tests/ui/pattern/mut_preserve_binding_mode_2021.rs

@@ -1,6 +1,6 @@
 //@ edition: 2021
 //@ compile-flags: -Zunstable-options
-#![feature(mut_dont_reset_binding_mode_2024)]
+#![feature(mut_preserve_binding_mode_2024)]
 
 struct Foo(u8);
 

tests/ui/pattern/mut_preserve_binding_mode_2021.stderr

@@ -1,5 +1,5 @@
 error[E0308]: mismatched types
-  --> $DIR/mut_dont_reset_binding_mode_2021.rs:9:9
+  --> $DIR/mut_preserve_binding_mode_2021.rs:9:9
    |
 LL |     let Foo(mut a) = &Foo(0);
    |             ----- expected due to the type of this binding
@@ -13,7 +13,7 @@ LL +     a = 42;
    |
 
 error[E0308]: mismatched types
-  --> $DIR/mut_dont_reset_binding_mode_2021.rs:13:9
+  --> $DIR/mut_preserve_binding_mode_2021.rs:13:9
    |
 LL |     let Foo(mut a) = &mut Foo(0);
    |             ----- expected due to the type of this binding

tests/ui/pattern/mut_preserve_binding_mode_2024.rs

@@ -1,7 +1,7 @@
 //@ run-pass
 //@ edition: 2024
 //@ compile-flags: -Zunstable-options
-#![feature(mut_dont_reset_binding_mode_2024)]
+#![feature(mut_preserve_binding_mode_2024)]
 #![allow(unused)]
 
 struct Foo(u8);

tests/ui/pattern/mut_preserve_binding_mode_2024_lint.rs

@@ -1,5 +1,5 @@
 //@ edition: 2021
-#![feature(mut_dont_reset_binding_mode_2024)]
+#![feature(mut_preserve_binding_mode_2024)]
 #![allow(unused)]
 #![forbid(dereferencing_mut_binding)]
 

tests/ui/pattern/mut_preserve_binding_mode_2024_lint.stderr

@@ -1,28 +1,28 @@
 error: dereferencing `mut` binding
-  --> $DIR/mut_dont_reset_binding_mode_2024_lint.rs:9:13
+  --> $DIR/mut_preserve_binding_mode_2024_lint.rs:9:13
    |
 LL |     let Foo(mut a) = &Foo(0);
    |             ^^^^^ `mut` dereferences the type of this binding
    |
 help: this will change in edition 2024
-  --> $DIR/mut_dont_reset_binding_mode_2024_lint.rs:9:13
+  --> $DIR/mut_preserve_binding_mode_2024_lint.rs:9:13
    |
 LL |     let Foo(mut a) = &Foo(0);
    |             ^^^^^
 note: the lint level is defined here
-  --> $DIR/mut_dont_reset_binding_mode_2024_lint.rs:4:11
+  --> $DIR/mut_preserve_binding_mode_2024_lint.rs:4:11
    |
 LL | #![forbid(dereferencing_mut_binding)]
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: dereferencing `mut` binding
-  --> $DIR/mut_dont_reset_binding_mode_2024_lint.rs:13:13
+  --> $DIR/mut_preserve_binding_mode_2024_lint.rs:13:13
    |
 LL |     let Foo(mut a) = &mut Foo(0);
    |             ^^^^^ `mut` dereferences the type of this binding
    |
 help: this will change in edition 2024
-  --> $DIR/mut_dont_reset_binding_mode_2024_lint.rs:13:13
+  --> $DIR/mut_preserve_binding_mode_2024_lint.rs:13:13
    |
 LL |     let Foo(mut a) = &mut Foo(0);
    |             ^^^^^