| // Copyright 2018 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. |
| |
| #![feature(unsized_locals)] |
| |
| use std::fmt; |
| |
| fn gen_foo() -> Box<fmt::Display> { |
| Box::new(Box::new("foo")) |
| } |
| |
| fn foo(x: fmt::Display) { |
| assert_eq!(x.to_string(), "foo"); |
| } |
| |
| fn foo_indirect(x: fmt::Display) { |
| foo(x); |
| } |
| |
| fn main() { |
| foo(*gen_foo()); |
| foo_indirect(*gen_foo()); |
| |
| { |
| let x: fmt::Display = *gen_foo(); |
| foo(x); |
| } |
| |
| { |
| let x: fmt::Display = *gen_foo(); |
| let y: fmt::Display = *gen_foo(); |
| foo(x); |
| foo(y); |
| } |
| |
| { |
| let mut cnt: usize = 3; |
| let x = loop { |
| let x: fmt::Display = *gen_foo(); |
| if cnt == 0 { |
| break x; |
| } else { |
| cnt -= 1; |
| } |
| }; |
| foo(x); |
| } |
| |
| { |
| let x: fmt::Display = *gen_foo(); |
| let x = if true { |
| x |
| } else { |
| *gen_foo() |
| }; |
| foo(x); |
| } |
| } |