1 files changed, 53 insertions, 0 deletions

diff --git a/tests/ui/issues/issue-71676-1.rs b/tests/ui/issues/issue-71676-1.rs
new file mode 100644
index 000000000..6e87c7174
--- /dev/null
+++ b/tests/ui/issues/issue-71676-1.rs
@@ -0,0 +1,53 @@
+// run-rustfix
+use std::ops::Deref;
+use std::ops::DerefMut;
+struct Bar(u8);
+struct Foo(Bar);
+struct Emm(Foo);
+impl Deref for Bar{
+    type Target = u8;
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+impl Deref for Foo {
+    type Target = Bar;
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+impl Deref for Emm {
+    type Target = Foo;
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+impl DerefMut for Bar{
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+impl DerefMut for Foo {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+impl DerefMut for Emm {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.0
+    }
+}
+fn main() {
+    // Suggest dereference with arbitrary mutability
+    let a = Emm(Foo(Bar(0)));
+    let _: *const u8 = &a; //~ ERROR mismatched types
+
+    let mut a = Emm(Foo(Bar(0)));
+    let _: *mut u8 = &a; //~ ERROR mismatched types
+
+    let a = Emm(Foo(Bar(0)));
+    let _: *const u8 = &mut a; //~ ERROR mismatched types
+
+    let mut a = Emm(Foo(Bar(0)));
+    let _: *mut u8 = &mut a; //~ ERROR mismatched types
+}