bdc182cc41
fail!() used to require owned strings but can handle static strings now. Also, it can pass its arguments to fmt!() on its own, no need for the caller to call fmt!() itself.
43 lines
1.1 KiB
Rust
43 lines
1.1 KiB
Rust
// Copyright 2012-2013 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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struct HTMLImageData {
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image: Option<~str>
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}
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struct ElementData {
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kind: ~ElementKind
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}
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enum ElementKind {
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HTMLImageElement(HTMLImageData)
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}
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enum NodeKind {
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Element(ElementData)
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}
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struct NodeData {
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kind: ~NodeKind
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}
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fn main() {
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let mut id = HTMLImageData { image: None };
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let ed = ElementData { kind: ~HTMLImageElement(id) };
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let n = NodeData {kind : ~Element(ed)};
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// n.b. span could be better
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match n.kind {
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~Element(ed) => match ed.kind { //~ ERROR non-exhaustive patterns
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~HTMLImageElement(ref d) if d.image.is_some() => { true }
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},
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_ => fail!("WAT") //~ ERROR unreachable pattern
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};
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}
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