Make it allow-by-default to appease CI

Author: Nadrieril

compiler/rustc_lint_defs/src/builtin.rs

@@ -1586,6 +1586,7 @@ declare_lint! {
     /// ### Example
     ///
     /// ```rust
+    /// # #![warn(dereferencing_mut_binding)]
     /// let x = Some(123u32);
     /// let _y = match &x {
     ///     Some(mut x) => {
@@ -1604,7 +1605,7 @@ declare_lint! {
     /// `u32`, which was deeped surprising. After edition 2024, adding `mut` will not change the
     /// type of `x`. This lint warns users of editions before 2024 to update their code.
     pub DEREFERENCING_MUT_BINDING,
-    Warn,
+    Allow,
     "detects `mut x` bindings that change the type of `x`"
 }
 

tests/ui/pattern/move-ref-patterns/move-ref-patterns-default-binding-modes-fixable.fixed

@@ -1,5 +1,6 @@
 // run-rustfix
 #![allow(unused_variables)]
+#![warn(dereferencing_mut_binding)]
 fn main() {
     struct U;
 

tests/ui/pattern/move-ref-patterns/move-ref-patterns-default-binding-modes-fixable.rs

@@ -1,5 +1,6 @@
 // run-rustfix
 #![allow(unused_variables)]
+#![warn(dereferencing_mut_binding)]
 fn main() {
     struct U;
 

tests/ui/pattern/move-ref-patterns/move-ref-patterns-default-binding-modes-fixable.stderr

@@ -1,18 +1,22 @@
 warning: dereferencing `mut` binding
-  --> $DIR/move-ref-patterns-default-binding-modes-fixable.rs:10:13
+  --> $DIR/move-ref-patterns-default-binding-modes-fixable.rs:11:13
    |
 LL |     let (a, mut b) = &mut p;
    |             ^^^^^ `mut` dereferences the type of this binding
    |
 help: this will change in edition 2024
-  --> $DIR/move-ref-patterns-default-binding-modes-fixable.rs:10:13
+  --> $DIR/move-ref-patterns-default-binding-modes-fixable.rs:11:13
    |
 LL |     let (a, mut b) = &mut p;
    |             ^^^^^
-   = note: `#[warn(dereferencing_mut_binding)]` on by default
+note: the lint level is defined here
+  --> $DIR/move-ref-patterns-default-binding-modes-fixable.rs:3:9
+   |
+LL | #![warn(dereferencing_mut_binding)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0507]: cannot move out of a mutable reference
-  --> $DIR/move-ref-patterns-default-binding-modes-fixable.rs:10:22
+  --> $DIR/move-ref-patterns-default-binding-modes-fixable.rs:11:22
    |
 LL |     let (a, mut b) = &mut p;
    |             -----    ^^^^^^

tests/ui/pattern/move-ref-patterns/move-ref-patterns-default-binding-modes.rs

@@ -1,3 +1,4 @@
+#![warn(dereferencing_mut_binding)]
 fn main() {
     struct U;
 

tests/ui/pattern/move-ref-patterns/move-ref-patterns-default-binding-modes.stderr

@@ -1,18 +1,22 @@
 warning: dereferencing `mut` binding
-  --> $DIR/move-ref-patterns-default-binding-modes.rs:8:13
+  --> $DIR/move-ref-patterns-default-binding-modes.rs:9:13
    |
 LL |     let (a, mut b) = &p;
    |             ^^^^^ `mut` dereferences the type of this binding
    |
 help: this will change in edition 2024
-  --> $DIR/move-ref-patterns-default-binding-modes.rs:8:13
+  --> $DIR/move-ref-patterns-default-binding-modes.rs:9:13
    |
 LL |     let (a, mut b) = &p;
    |             ^^^^^
-   = note: `#[warn(dereferencing_mut_binding)]` on by default
+note: the lint level is defined here
+  --> $DIR/move-ref-patterns-default-binding-modes.rs:1:9
+   |
+LL | #![warn(dereferencing_mut_binding)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0507]: cannot move out of a shared reference
-  --> $DIR/move-ref-patterns-default-binding-modes.rs:8:22
+  --> $DIR/move-ref-patterns-default-binding-modes.rs:9:22
    |
 LL |     let (a, mut b) = &p;
    |             -----    ^^

tests/ui/rfcs/rfc-2005-default-binding-mode/for.rs

@@ -1,3 +1,4 @@
+#![warn(dereferencing_mut_binding)]
 struct Foo {}
 
 pub fn main() {

tests/ui/rfcs/rfc-2005-default-binding-mode/for.stderr

@@ -1,18 +1,22 @@
 warning: dereferencing `mut` binding
-  --> $DIR/for.rs:6:13
+  --> $DIR/for.rs:7:13
    |
 LL |     for (n, mut m) in &tups {
    |             ^^^^^ `mut` dereferences the type of this binding
    |
 help: this will change in edition 2024
-  --> $DIR/for.rs:6:13
+  --> $DIR/for.rs:7:13
    |
 LL |     for (n, mut m) in &tups {
    |             ^^^^^
-   = note: `#[warn(dereferencing_mut_binding)]` on by default
+note: the lint level is defined here
+  --> $DIR/for.rs:1:9
+   |
+LL | #![warn(dereferencing_mut_binding)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error[E0507]: cannot move out of a shared reference
-  --> $DIR/for.rs:6:23
+  --> $DIR/for.rs:7:23
    |
 LL |     for (n, mut m) in &tups {
    |             -----     ^^^^^