tests

src/test/ui/issues/issue-50264-inner-deref-trait/option-as_deref.stderr

@@ -6,7 +6,6 @@ LL |     let _result = &Some(42).as_deref();
    |
    = note: the following trait bounds were not satisfied:
            `{integer}: Deref`
-           `<{integer} as Deref>::Target = _`
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-50264-inner-deref-trait/option-as_deref_mut.stderr

@@ -6,7 +6,7 @@ LL |     let _result = &mut Some(42).as_deref_mut();
    |
    = note: the following trait bounds were not satisfied:
            `{integer}: DerefMut`
-           `<{integer} as Deref>::Target = _`
+           `{integer}: Deref`
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-50264-inner-deref-trait/result-as_deref.stderr

@@ -6,7 +6,6 @@ LL |     let _result = &Ok(42).as_deref();
    |
    = note: the following trait bounds were not satisfied:
            `{integer}: Deref`
-           `<{integer} as Deref>::Target = _`
 
 error: aborting due to previous error
 

src/test/ui/issues/issue-50264-inner-deref-trait/result-as_deref_mut.stderr

@@ -6,7 +6,7 @@ LL |     let _result = &mut Ok(42).as_deref_mut();
    |
    = note: the following trait bounds were not satisfied:
            `{integer}: DerefMut`
-           `<{integer} as Deref>::Target = _`
+           `{integer}: Deref`
 
 error: aborting due to previous error
 

src/test/ui/resolve/issue-85671.rs

@@ -0,0 +1,37 @@
+// check-pass
+
+// Some trait with a function that returns a slice:
+pub trait AsSlice {
+    type Element;
+    fn as_slice(&self) -> &[Self::Element];
+}
+
+// Some type
+pub struct A<Cont>(Cont);
+
+// Here we say that if A wraps a slice, then it implements AsSlice
+impl<'a, Element> AsSlice for A<&'a [Element]> {
+    type Element = Element;
+    fn as_slice(&self) -> &[Self::Element] {
+        self.0
+    }
+}
+
+impl<Cont> A<Cont> {
+    // We want this function to work
+    pub fn failing<Coef>(&self)
+    where
+        Self: AsSlice<Element = Coef>,
+    {
+        self.as_ref_a().as_ref_a();
+    }
+
+    pub fn as_ref_a<Coef>(&self) -> A<&[<Self as AsSlice>::Element]>
+    where
+        Self: AsSlice<Element = Coef>,
+    {
+        A(self.as_slice())
+    }
+}
+
+fn main() {}