44 lines
1.2 KiB
Rust
44 lines
1.2 KiB
Rust
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// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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fn main() { let _ = g(Some(E::F(K))); }
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type R = Result<(), ()>;
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struct K;
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enum E {
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F(K), // must not be built-in type
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#[allow(dead_code)]
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G(Box<E>, Box<E>),
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}
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fn translate(x: R) -> R { x }
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fn g(mut status: Option<E>) -> R {
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loop {
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match status {
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Some(infix_or_postfix) => match infix_or_postfix {
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E::F(_op) => { // <- must be captured by value
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match Ok(()) {
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Err(err) => return Err(err),
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Ok(_) => {},
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};
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}
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_ => (),
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},
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_ => match translate(Err(())) {
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Err(err) => return Err(err),
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Ok(_) => {},
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}
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}
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status = None;
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}
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}
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