Auto merge of #124034 - GuillaumeGomez:rollup-ayztp9l, r=GuillaumeGomez

Rollup of 7 pull requests

Successful merges:

 - #122811 (Move `SourceMap` initialization)
 - #123512 (Match ergonomics 2024: Implement eat-one-layer)
 - #123811 (Use queue-based `RwLock` on more platforms)
 - #123859 (Remove uneeded clones now that TrustedStep implies Copy)
 - #123979 (Subtype predicates only exist on inference types, so we can allow them to register opaque types within them.)
 - #124016 (Outline default query and hook provider function implementations)
 - #124023 (Allow workproducts without object files.)

r? `@ghost`
`@rustbot` modify labels: rollup

11 files changed, 576 insertions, 0 deletions

diff --git a/tests/run-make/artifact-incr-cache-no-obj/lib.rs b/tests/run-make/artifact-incr-cache-no-obj/lib.rs
new file mode 100644
index 00000000000..fa4048594e3
--- /dev/null
+++ b/tests/run-make/artifact-incr-cache-no-obj/lib.rs
@@ -0,0 +1,6 @@
+#![crate_name = "foo"]
+
+#[inline(never)]
+pub fn add(a: u32, b: u32) -> u32 {
+    a + b
+}
diff --git a/tests/run-make/artifact-incr-cache-no-obj/rmake.rs b/tests/run-make/artifact-incr-cache-no-obj/rmake.rs
new file mode 100644
index 00000000000..de55de2a1ee
--- /dev/null
+++ b/tests/run-make/artifact-incr-cache-no-obj/rmake.rs
@@ -0,0 +1,23 @@
+// emitting an object file is not necessary if user didn't ask for one
+//
+// This test is similar to run-make/artifact-incr-cache but it doesn't
+// require to emit an object file
+//
+// Fixes: rust-lang/rust#123234
+
+extern crate run_make_support;
+
+use run_make_support::{rustc, tmp_dir};
+
+fn main() {
+    let inc_dir = tmp_dir();
+
+    for _ in 0..=1 {
+        rustc()
+            .input("lib.rs")
+            .crate_type("lib")
+            .emit("asm,dep-info,link,mir,llvm-ir,llvm-bc")
+            .incremental(&inc_dir)
+            .run();
+    }
+}
diff --git a/tests/ui/match/ref_pat_eat_one_layer_2024/feature-gate-ref_pat_eat_one_layer_2024.rs b/tests/ui/match/ref_pat_eat_one_layer_2024/feature-gate-ref_pat_eat_one_layer_2024.rs
new file mode 100644
index 00000000000..83f1ee6a77e
--- /dev/null
+++ b/tests/ui/match/ref_pat_eat_one_layer_2024/feature-gate-ref_pat_eat_one_layer_2024.rs
@@ -0,0 +1,37 @@
+//@ edition: 2024
+//@ compile-flags: -Zunstable-options
+
+pub fn main() {
+    if let Some(Some(&x)) = &Some(&Some(0)) {
+        //~^ ERROR: mismatched types
+        let _: u32 = x;
+    }
+    if let Some(Some(&x)) = &Some(Some(&0)) {
+        let _: &u32 = x;
+        //~^ ERROR: mismatched types
+    }
+    if let Some(Some(&&x)) = &Some(Some(&0)) {
+        //~^ ERROR: mismatched types
+        let _: u32 = x;
+    }
+    if let Some(&Some(x)) = &Some(Some(0)) {
+        //~^ ERROR: mismatched types
+        let _: u32 = x;
+    }
+    if let Some(Some(&mut x)) = &mut Some(&mut Some(0)) {
+        //~^ ERROR: mismatched types
+        let _: u32 = x;
+    }
+    if let Some(Some(&x)) = &Some(&Some(0)) {
+        //~^ ERROR: mismatched types
+        let _: u32 = x;
+    }
+    if let Some(&mut Some(&x)) = &Some(&mut Some(0)) {
+        //~^ ERROR: mismatched types
+        let _: u32 = x;
+    }
+    if let Some(&Some(&mut x)) = &mut Some(&Some(0)) {
+        //~^ ERROR: mismatched types
+        let _: u32 = x;
+    }
+}
diff --git a/tests/ui/match/ref_pat_eat_one_layer_2024/feature-gate-ref_pat_eat_one_layer_2024.stderr b/tests/ui/match/ref_pat_eat_one_layer_2024/feature-gate-ref_pat_eat_one_layer_2024.stderr
new file mode 100644
index 00000000000..132fe421a18
--- /dev/null
+++ b/tests/ui/match/ref_pat_eat_one_layer_2024/feature-gate-ref_pat_eat_one_layer_2024.stderr
@@ -0,0 +1,128 @@
+error[E0308]: mismatched types
+  --> $DIR/feature-gate-ref_pat_eat_one_layer_2024.rs:5:22
+   |
+LL |     if let Some(Some(&x)) = &Some(&Some(0)) {
+   |                      ^^     --------------- this expression has type `&Option<&Option<{integer}>>`
+   |                      |
+   |                      expected integer, found `&_`
+   |
+   = note:   expected type `{integer}`
+           found reference `&_`
+help: consider removing `&` from the pattern
+   |
+LL |     if let Some(Some(x)) = &Some(&Some(0)) {
+   |                      ~
+
+error[E0308]: mismatched types
+  --> $DIR/feature-gate-ref_pat_eat_one_layer_2024.rs:10:23
+   |
+LL |         let _: &u32 = x;
+   |                ----   ^ expected `&u32`, found integer
+   |                |
+   |                expected due to this
+   |
+help: consider borrowing here
+   |
+LL |         let _: &u32 = &x;
+   |                       +
+
+error[E0308]: mismatched types
+  --> $DIR/feature-gate-ref_pat_eat_one_layer_2024.rs:13:23
+   |
+LL |     if let Some(Some(&&x)) = &Some(Some(&0)) {
+   |                       ^^     --------------- this expression has type `&Option<Option<&{integer}>>`
+   |                       |
+   |                       expected integer, found `&_`
+   |
+   = note:   expected type `{integer}`
+           found reference `&_`
+help: consider removing `&` from the pattern
+   |
+LL -     if let Some(Some(&&x)) = &Some(Some(&0)) {
+LL +     if let Some(Some(&x)) = &Some(Some(&0)) {
+   |
+
+error[E0308]: mismatched types
+  --> $DIR/feature-gate-ref_pat_eat_one_layer_2024.rs:17:17
+   |
+LL |     if let Some(&Some(x)) = &Some(Some(0)) {
+   |                 ^^^^^^^^    -------------- this expression has type `&Option<Option<{integer}>>`
+   |                 |
+   |                 expected `Option<{integer}>`, found `&_`
+   |
+   = note:   expected enum `Option<{integer}>`
+           found reference `&_`
+
+error[E0308]: mismatched types
+  --> $DIR/feature-gate-ref_pat_eat_one_layer_2024.rs:21:22
+   |
+LL |     if let Some(Some(&mut x)) = &mut Some(&mut Some(0)) {
+   |                      ^^^^^^     ----------------------- this expression has type `&mut Option<&mut Option<{integer}>>`
+   |                      |
+   |                      expected integer, found `&mut _`
+   |
+   = note:           expected type `{integer}`
+           found mutable reference `&mut _`
+note: to declare a mutable binding use: `mut x`
+  --> $DIR/feature-gate-ref_pat_eat_one_layer_2024.rs:21:22
+   |
+LL |     if let Some(Some(&mut x)) = &mut Some(&mut Some(0)) {
+   |                      ^^^^^^
+help: consider removing `&mut` from the pattern
+   |
+LL |     if let Some(Some(x)) = &mut Some(&mut Some(0)) {
+   |                      ~
+
+error[E0308]: mismatched types
+  --> $DIR/feature-gate-ref_pat_eat_one_layer_2024.rs:25:22
+   |
+LL |     if let Some(Some(&x)) = &Some(&Some(0)) {
+   |                      ^^     --------------- this expression has type `&Option<&Option<{integer}>>`
+   |                      |
+   |                      expected integer, found `&_`
+   |
+   = note:   expected type `{integer}`
+           found reference `&_`
+help: consider removing `&` from the pattern
+   |
+LL |     if let Some(Some(x)) = &Some(&Some(0)) {
+   |                      ~
+
+error[E0308]: mismatched types
+  --> $DIR/feature-gate-ref_pat_eat_one_layer_2024.rs:29:27
+   |
+LL |     if let Some(&mut Some(&x)) = &Some(&mut Some(0)) {
+   |                           ^^     ------------------- this expression has type `&Option<&mut Option<{integer}>>`
+   |                           |
+   |                           expected integer, found `&_`
+   |
+   = note:   expected type `{integer}`
+           found reference `&_`
+help: consider removing `&` from the pattern
+   |
+LL |     if let Some(&mut Some(x)) = &Some(&mut Some(0)) {
+   |                           ~
+
+error[E0308]: mismatched types
+  --> $DIR/feature-gate-ref_pat_eat_one_layer_2024.rs:33:23
+   |
+LL |     if let Some(&Some(&mut x)) = &mut Some(&Some(0)) {
+   |                       ^^^^^^     ------------------- this expression has type `&mut Option<&Option<{integer}>>`
+   |                       |
+   |                       expected integer, found `&mut _`
+   |
+   = note:           expected type `{integer}`
+           found mutable reference `&mut _`
+note: to declare a mutable binding use: `mut x`
+  --> $DIR/feature-gate-ref_pat_eat_one_layer_2024.rs:33:23
+   |
+LL |     if let Some(&Some(&mut x)) = &mut Some(&Some(0)) {
+   |                       ^^^^^^
+help: consider removing `&mut` from the pattern
+   |
+LL |     if let Some(&Some(x)) = &mut Some(&Some(0)) {
+   |                       ~
+
+error: aborting due to 8 previous errors
+
+For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/match/ref_pat_eat_one_layer_2024/ref_pat_eat_one_layer_2021.rs b/tests/ui/match/ref_pat_eat_one_layer_2024/ref_pat_eat_one_layer_2021.rs
new file mode 100644
index 00000000000..d28567f2859
--- /dev/null
+++ b/tests/ui/match/ref_pat_eat_one_layer_2024/ref_pat_eat_one_layer_2021.rs
@@ -0,0 +1,37 @@
+//@ edition: 2021
+#![allow(incomplete_features)]
+#![feature(ref_pat_eat_one_layer_2024)]
+pub fn main() {
+    if let Some(Some(&x)) = &Some(&Some(0)) {
+        //~^ ERROR: mismatched types
+        let _: u32 = x;
+    }
+    if let Some(Some(&x)) = &Some(Some(&0)) {
+        let _: &u32 = x;
+        //~^ ERROR: mismatched types
+    }
+    if let Some(Some(&&x)) = &Some(Some(&0)) {
+        //~^ ERROR: mismatched types
+        let _: u32 = x;
+    }
+    if let Some(&Some(x)) = &Some(Some(0)) {
+        //~^ ERROR: mismatched types
+        let _: u32 = x;
+    }
+    if let Some(Some(&mut x)) = &mut Some(&mut Some(0)) {
+        //~^ ERROR: mismatched types
+        let _: u32 = x;
+    }
+    if let Some(Some(&x)) = &Some(&Some(0)) {
+        //~^ ERROR: mismatched types
+        let _: u32 = x;
+    }
+    if let Some(&mut Some(&x)) = &Some(&mut Some(0)) {
+        //~^ ERROR: mismatched types
+        let _: u32 = x;
+    }
+    if let Some(&Some(&mut x)) = &mut Some(&Some(0)) {
+        //~^ ERROR: mismatched types
+        let _: u32 = x;
+    }
+}
diff --git a/tests/ui/match/ref_pat_eat_one_layer_2024/ref_pat_eat_one_layer_2021.stderr b/tests/ui/match/ref_pat_eat_one_layer_2024/ref_pat_eat_one_layer_2021.stderr
new file mode 100644
index 00000000000..28706f89c06
--- /dev/null
+++ b/tests/ui/match/ref_pat_eat_one_layer_2024/ref_pat_eat_one_layer_2021.stderr
@@ -0,0 +1,128 @@
+error[E0308]: mismatched types
+  --> $DIR/ref_pat_eat_one_layer_2021.rs:5:22
+   |
+LL |     if let Some(Some(&x)) = &Some(&Some(0)) {
+   |                      ^^     --------------- this expression has type `&Option<&Option<{integer}>>`
+   |                      |
+   |                      expected integer, found `&_`
+   |
+   = note:   expected type `{integer}`
+           found reference `&_`
+help: consider removing `&` from the pattern
+   |
+LL |     if let Some(Some(x)) = &Some(&Some(0)) {
+   |                      ~
+
+error[E0308]: mismatched types
+  --> $DIR/ref_pat_eat_one_layer_2021.rs:10:23
+   |
+LL |         let _: &u32 = x;
+   |                ----   ^ expected `&u32`, found integer
+   |                |
+   |                expected due to this
+   |
+help: consider borrowing here
+   |
+LL |         let _: &u32 = &x;
+   |                       +
+
+error[E0308]: mismatched types
+  --> $DIR/ref_pat_eat_one_layer_2021.rs:13:23
+   |
+LL |     if let Some(Some(&&x)) = &Some(Some(&0)) {
+   |                       ^^     --------------- this expression has type `&Option<Option<&{integer}>>`
+   |                       |
+   |                       expected integer, found `&_`
+   |
+   = note:   expected type `{integer}`
+           found reference `&_`
+help: consider removing `&` from the pattern
+   |
+LL -     if let Some(Some(&&x)) = &Some(Some(&0)) {
+LL +     if let Some(Some(&x)) = &Some(Some(&0)) {
+   |
+
+error[E0308]: mismatched types
+  --> $DIR/ref_pat_eat_one_layer_2021.rs:17:17
+   |
+LL |     if let Some(&Some(x)) = &Some(Some(0)) {
+   |                 ^^^^^^^^    -------------- this expression has type `&Option<Option<{integer}>>`
+   |                 |
+   |                 expected `Option<{integer}>`, found `&_`
+   |
+   = note:   expected enum `Option<{integer}>`
+           found reference `&_`
+
+error[E0308]: mismatched types
+  --> $DIR/ref_pat_eat_one_layer_2021.rs:21:22
+   |
+LL |     if let Some(Some(&mut x)) = &mut Some(&mut Some(0)) {
+   |                      ^^^^^^     ----------------------- this expression has type `&mut Option<&mut Option<{integer}>>`
+   |                      |
+   |                      expected integer, found `&mut _`
+   |
+   = note:           expected type `{integer}`
+           found mutable reference `&mut _`
+note: to declare a mutable binding use: `mut x`
+  --> $DIR/ref_pat_eat_one_layer_2021.rs:21:22
+   |
+LL |     if let Some(Some(&mut x)) = &mut Some(&mut Some(0)) {
+   |                      ^^^^^^
+help: consider removing `&mut` from the pattern
+   |
+LL |     if let Some(Some(x)) = &mut Some(&mut Some(0)) {
+   |                      ~
+
+error[E0308]: mismatched types
+  --> $DIR/ref_pat_eat_one_layer_2021.rs:25:22
+   |
+LL |     if let Some(Some(&x)) = &Some(&Some(0)) {
+   |                      ^^     --------------- this expression has type `&Option<&Option<{integer}>>`
+   |                      |
+   |                      expected integer, found `&_`
+   |
+   = note:   expected type `{integer}`
+           found reference `&_`
+help: consider removing `&` from the pattern
+   |
+LL |     if let Some(Some(x)) = &Some(&Some(0)) {
+   |                      ~
+
+error[E0308]: mismatched types
+  --> $DIR/ref_pat_eat_one_layer_2021.rs:29:27
+   |
+LL |     if let Some(&mut Some(&x)) = &Some(&mut Some(0)) {
+   |                           ^^     ------------------- this expression has type `&Option<&mut Option<{integer}>>`
+   |                           |
+   |                           expected integer, found `&_`
+   |
+   = note:   expected type `{integer}`
+           found reference `&_`
+help: consider removing `&` from the pattern
+   |
+LL |     if let Some(&mut Some(x)) = &Some(&mut Some(0)) {
+   |                           ~
+
+error[E0308]: mismatched types
+  --> $DIR/ref_pat_eat_one_layer_2021.rs:33:23
+   |
+LL |     if let Some(&Some(&mut x)) = &mut Some(&Some(0)) {
+   |                       ^^^^^^     ------------------- this expression has type `&mut Option<&Option<{integer}>>`
+   |                       |
+   |                       expected integer, found `&mut _`
+   |
+   = note:           expected type `{integer}`
+           found mutable reference `&mut _`
+note: to declare a mutable binding use: `mut x`
+  --> $DIR/ref_pat_eat_one_layer_2021.rs:33:23
+   |
+LL |     if let Some(&Some(&mut x)) = &mut Some(&Some(0)) {
+   |                       ^^^^^^
+help: consider removing `&mut` from the pattern
+   |
+LL |     if let Some(&Some(x)) = &mut Some(&Some(0)) {
+   |                       ~
+
+error: aborting due to 8 previous errors
+
+For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/match/ref_pat_eat_one_layer_2024/ref_pat_eat_one_layer_2024.rs b/tests/ui/match/ref_pat_eat_one_layer_2024/ref_pat_eat_one_layer_2024.rs
new file mode 100644
index 00000000000..f1ac3e340e9
--- /dev/null
+++ b/tests/ui/match/ref_pat_eat_one_layer_2024/ref_pat_eat_one_layer_2024.rs
@@ -0,0 +1,65 @@
+//@ run-pass
+//@ edition: 2024
+//@ compile-flags: -Zunstable-options
+#![allow(incomplete_features)]
+#![feature(ref_pat_eat_one_layer_2024)]
+
+pub fn main() {
+    if let Some(Some(&x)) = &Some(&Some(0)) {
+        let _: u32 = x;
+    }
+    if let Some(Some(&x)) = &Some(Some(&0)) {
+        let _: &u32 = x;
+    }
+    if let Some(Some(&&x)) = &Some(Some(&0)) {
+        let _: u32 = x;
+    }
+    if let Some(&Some(x)) = &Some(Some(0)) {
+        let _: u32 = x;
+    }
+    if let Some(Some(&mut x)) = &mut Some(&mut Some(0)) {
+        let _: u32 = x;
+    }
+    if let Some(Some(&x)) = &Some(&Some(0)) {
+        let _: u32 = x;
+    }
+    if let Some(&mut Some(&x)) = &Some(&mut Some(0)) {
+        let _: u32 = x;
+    }
+    if let Some(&Some(&x)) = &mut Some(&Some(0)) {
+        let _: u32 = x;
+    }
+    if let Some(&Some(x)) = &mut Some(&Some(0)) {
+        let _: &u32 = x;
+    }
+    if let Some(&Some(&mut ref x)) = Some(&Some(&mut 0)) {
+        let _: &u32 = x;
+    }
+    if let Some(Some(&mut x)) = &Some(Some(&mut 0)) {
+        let _: &u32 = x;
+    }
+    if let &Some(Some(x)) = &Some(&mut Some(0)) {
+        let _: &u32 = x;
+    }
+    if let Some(&Some(&x)) = &Some(&mut Some(0)) {
+        let _: u32 = x;
+    }
+    if let Some(&Some(&x)) = &Some(&Some(0)) {
+        let _: u32 = x;
+    }
+    if let Some(&Some(&x)) = &Some(&mut Some(0)) {
+        let _: u32 = x;
+    }
+    if let Some(&Some(Some(&x))) = &Some(Some(&mut Some(0))) {
+        let _: u32 = x;
+    }
+
+    let &mut x = &&mut 0;
+    let _: &u32 = x;
+
+    let &mut x = &&&&&&&&&&&&&&&&&&&&&&&&&&&&mut 0;
+    let _: &u32 = x;
+
+    let &mut &mut &mut &mut x = &mut &&&&mut &&&mut &mut 0;
+    let _: &u32 = x;
+}
diff --git a/tests/ui/match/ref_pat_eat_one_layer_2024/ref_pat_eat_one_layer_2024_fail.rs b/tests/ui/match/ref_pat_eat_one_layer_2024/ref_pat_eat_one_layer_2024_fail.rs
new file mode 100644
index 00000000000..ec091bb1746
--- /dev/null
+++ b/tests/ui/match/ref_pat_eat_one_layer_2024/ref_pat_eat_one_layer_2024_fail.rs
@@ -0,0 +1,33 @@
+//@ edition: 2024
+//@ compile-flags: -Zunstable-options
+#![allow(incomplete_features)]
+#![feature(ref_pat_eat_one_layer_2024)]
+
+pub fn main() {
+    if let Some(&mut Some(&_)) = &Some(&Some(0)) {
+        //~^ ERROR: mismatched types
+    }
+    if let Some(&Some(&mut _)) = &Some(&mut Some(0)) {
+        //~^ ERROR: mismatched types
+    }
+    if let Some(&Some(x)) = &mut Some(&Some(0)) {
+        let _: &mut u32 = x;
+        //~^ ERROR: mismatched types
+    }
+    if let Some(&Some(&_)) = Some(&Some(&mut 0)) {
+        //~^ ERROR: mismatched types
+    }
+    if let Some(&Some(&mut _)) = &mut Some(&Some(0)) {
+        //~^ ERROR: mismatched types
+    }
+    if let Some(&Some(Some((&mut _)))) = &Some(Some(&mut Some(0))) {
+        //~^ ERROR: mismatched types
+    }
+
+
+    let &mut _= &&0;
+    //~^ ERROR: mismatched types
+
+    let &mut _ = &&&&&&&&&&&&&&&&&&&&&&&&&&&&0;
+    //~^ ERROR: mismatched types
+}
diff --git a/tests/ui/match/ref_pat_eat_one_layer_2024/ref_pat_eat_one_layer_2024_fail.stderr b/tests/ui/match/ref_pat_eat_one_layer_2024/ref_pat_eat_one_layer_2024_fail.stderr
new file mode 100644
index 00000000000..be71ee606c7
--- /dev/null
+++ b/tests/ui/match/ref_pat_eat_one_layer_2024/ref_pat_eat_one_layer_2024_fail.stderr
@@ -0,0 +1,91 @@
+error[E0308]: mismatched types
+  --> $DIR/ref_pat_eat_one_layer_2024_fail.rs:7:17
+   |
+LL |     if let Some(&mut Some(&_)) = &Some(&Some(0)) {
+   |                 ^^^^^^^^^^^^^    --------------- this expression has type `&Option<&Option<{integer}>>`
+   |                 |
+   |                 expected `Option<{integer}>`, found `&mut _`
+   |
+   = note:           expected enum `Option<{integer}>`
+           found mutable reference `&mut _`
+
+error[E0308]: mismatched types
+  --> $DIR/ref_pat_eat_one_layer_2024_fail.rs:10:23
+   |
+LL |     if let Some(&Some(&mut _)) = &Some(&mut Some(0)) {
+   |                       ^^^^^^     ------------------- this expression has type `&Option<&mut Option<{integer}>>`
+   |                       |
+   |                       expected integer, found `&mut _`
+   |
+   = note:           expected type `{integer}`
+           found mutable reference `&mut _`
+
+error[E0308]: mismatched types
+  --> $DIR/ref_pat_eat_one_layer_2024_fail.rs:14:27
+   |
+LL |         let _: &mut u32 = x;
+   |                --------   ^ types differ in mutability
+   |                |
+   |                expected due to this
+   |
+   = note: expected mutable reference `&mut u32`
+                      found reference `&{integer}`
+
+error[E0308]: mismatched types
+  --> $DIR/ref_pat_eat_one_layer_2024_fail.rs:17:23
+   |
+LL |     if let Some(&Some(&_)) = Some(&Some(&mut 0)) {
+   |                       ^^     ------------------- this expression has type `Option<&Option<&mut {integer}>>`
+   |                       |
+   |                       types differ in mutability
+   |
+   = note: expected mutable reference `&mut {integer}`
+                      found reference `&_`
+
+error[E0308]: mismatched types
+  --> $DIR/ref_pat_eat_one_layer_2024_fail.rs:20:23
+   |
+LL |     if let Some(&Some(&mut _)) = &mut Some(&Some(0)) {
+   |                       ^^^^^^     ------------------- this expression has type `&mut Option<&Option<{integer}>>`
+   |                       |
+   |                       expected integer, found `&mut _`
+   |
+   = note:           expected type `{integer}`
+           found mutable reference `&mut _`
+
+error[E0308]: mismatched types
+  --> $DIR/ref_pat_eat_one_layer_2024_fail.rs:23:29
+   |
+LL |     if let Some(&Some(Some((&mut _)))) = &Some(Some(&mut Some(0))) {
+   |                             ^^^^^^       ------------------------- this expression has type `&Option<Option<&mut Option<{integer}>>>`
+   |                             |
+   |                             expected integer, found `&mut _`
+   |
+   = note:           expected type `{integer}`
+           found mutable reference `&mut _`
+
+error[E0308]: mismatched types
+  --> $DIR/ref_pat_eat_one_layer_2024_fail.rs:28:9
+   |
+LL |     let &mut _= &&0;
+   |         ^^^^^^  --- this expression has type `&&{integer}`
+   |         |
+   |         expected integer, found `&mut _`
+   |
+   = note:           expected type `{integer}`
+           found mutable reference `&mut _`
+
+error[E0308]: mismatched types
+  --> $DIR/ref_pat_eat_one_layer_2024_fail.rs:31:9
+   |
+LL |     let &mut _ = &&&&&&&&&&&&&&&&&&&&&&&&&&&&0;
+   |         ^^^^^^   ----------------------------- this expression has type `&&&&&&&&&&&&&&&&&&&&&&&&&&&&{integer}`
+   |         |
+   |         expected integer, found `&mut _`
+   |
+   = note:           expected type `{integer}`
+           found mutable reference `&mut _`
+
+error: aborting due to 8 previous errors
+
+For more information about this error, try `rustc --explain E0308`.
diff --git a/tests/ui/match/ref_pat_eat_one_layer_2024/ref_pat_eat_one_layer_2024_fail2.rs b/tests/ui/match/ref_pat_eat_one_layer_2024/ref_pat_eat_one_layer_2024_fail2.rs
new file mode 100644
index 00000000000..36455488407
--- /dev/null
+++ b/tests/ui/match/ref_pat_eat_one_layer_2024/ref_pat_eat_one_layer_2024_fail2.rs
@@ -0,0 +1,11 @@
+//@ edition: 2024
+//@ compile-flags: -Zunstable-options
+#![allow(incomplete_features)]
+#![feature(ref_pat_eat_one_layer_2024)]
+
+pub fn main() {
+    if let Some(&Some(x)) = Some(&Some(&mut 0)) {
+        //~^ ERROR: cannot move out of a shared reference [E0507]
+        let _: &u32 = x;
+    }
+}
diff --git a/tests/ui/match/ref_pat_eat_one_layer_2024/ref_pat_eat_one_layer_2024_fail2.stderr b/tests/ui/match/ref_pat_eat_one_layer_2024/ref_pat_eat_one_layer_2024_fail2.stderr
new file mode 100644
index 00000000000..ccfb5c7a0c0
--- /dev/null
+++ b/tests/ui/match/ref_pat_eat_one_layer_2024/ref_pat_eat_one_layer_2024_fail2.stderr
@@ -0,0 +1,17 @@
+error[E0507]: cannot move out of a shared reference
+  --> $DIR/ref_pat_eat_one_layer_2024_fail2.rs:7:29
+   |
+LL |     if let Some(&Some(x)) = Some(&Some(&mut 0)) {
+   |                       -     ^^^^^^^^^^^^^^^^^^^
+   |                       |
+   |                       data moved here
+   |                       move occurs because `x` has type `&mut u32`, which does not implement the `Copy` trait
+   |
+help: consider borrowing the pattern binding
+   |
+LL |     if let Some(&Some(ref x)) = Some(&Some(&mut 0)) {
+   |                       +++
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0507`.