Auto merge of #29114 - apasel422:issue-27105, r=alexcrichton

Closes #27105.

src/test/run-pass/issue-27105.rs

+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use std::cell::RefCell;
+use std::rc::Rc;
+
+pub struct Callbacks {
+    callbacks: Vec<Rc<RefCell<FnMut(i32)>>>,
+}
+
+impl Callbacks {
+    pub fn register<F: FnMut(i32)+'static>(&mut self, callback: F) {
+        self.callbacks.push(Rc::new(RefCell::new(callback)));
+    }
+}
+
+fn main() {}