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54a0048b | 1 | // Copyright 2016 The Rust Project Developers. See the COPYRIGHT |
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2 | // file at the top-level directory of this distribution and at |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
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11 | #![allow(unreachable_code)] |
12 | ||
13 | // Regression test for #39808. The type parameter of `Owned` was | |
14 | // considered to be "unconstrained" because the type resulting from | |
15 | // `format!` (`String`) was not being propagated upward, owing to the | |
16 | // fact that the expression diverges. | |
17 | ||
18 | use std::borrow::Cow; | |
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19 | |
20 | fn main() { | |
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21 | let _ = if false { |
22 | Cow::Owned(format!("{:?}", panic!())) | |
23 | } else { | |
24 | Cow::Borrowed("") | |
54a0048b | 25 | }; |
223e47cc | 26 | } |