add test for issue 102964

Author: Rageking8

src/test/ui/issues/issue-102964.rs

@@ -0,0 +1,10 @@
+use std::rc::Rc;
+type Foo<'a, T> = &'a dyn Fn(&T);
+type RcFoo<'a, T> = Rc<Foo<'a, T>>;
+
+fn bar_function<T>(function: Foo<T>) -> RcFoo<T> {
+    //~^ ERROR mismatched types
+    let rc = Rc::new(function);
+}
+
+fn main() {}

src/test/ui/issues/issue-102964.stderr

@@ -0,0 +1,19 @@
+error[E0308]: mismatched types
+  --> $DIR/issue-102964.rs:5:41
+   |
+LL | fn bar_function<T>(function: Foo<T>) -> RcFoo<T> {
+   |    ------------                         ^^^^^^^^ expected struct `Rc`, found `()`
+   |    |
+   |    implicitly returns `()` as its body has no tail or `return` expression
+   |
+   = note: expected struct `Rc<&dyn for<'a> Fn(&'a T)>`
+           found unit type `()`
+help: consider returning the local binding `rc`
+   |
+LL ~     let rc = Rc::new(function);
+LL +     rc
+   |
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0308`.