// run-pass #![allow(dead_code)] use std::mem; struct Foo<T: ?Sized> { a: i64, b: bool, c: T, } fn main() { let foo: &Foo<i32> = &Foo { a: 1, b: false, c: 2i32 }; let foo_unsized: &Foo<dyn Send> = foo; assert_eq!(mem::size_of_val(foo), mem::size_of_val(foo_unsized)); }