Add 86351

Issue: rust-lang/rust#86351

Author: fanninpm

ices/86351.rs

@@ -0,0 +1,14 @@
+#![crate_type = "lib"]
+pub trait TestTrait {
+    type MyType;
+    fn func() -> Option<Self> where Self: Sized;
+}
+
+impl<T> dyn TestTrait<MyType = T> where Self: Sized {
+    fn other_func() -> Option<Self> {
+        match Self::func() {
+            Some(me) => Some(me),
+            None => None
+        }
+    }
+}