Add crash

Author: jagunter

tests/crashes/140823.rs

@@ -0,0 +1,11 @@
+//@ known-bug: #140823
+
+struct Container<T> {
+    data: T,
+}
+
+fn bang(callback: Box<dyn Fn(Container<&u8>)>) {
+    let fails: Box<dyn Fn(&Container<&u8>)> = callback;
+}
+
+fn main() {}