35 lines
948 B
Rust
35 lines
948 B
Rust
// Copyright 2014 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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// pretty-expanded FIXME #23616
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#![allow(unknown_features)]
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#![feature(box_patterns)]
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#![feature(box_syntax)]
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#[derive(Clone)]
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enum Noun
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{
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Atom(isize),
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Cell(Box<Noun>, Box<Noun>)
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}
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fn fas(n: &Noun) -> Noun
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{
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match n {
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&Noun::Cell(box Noun::Atom(2), box Noun::Cell(ref a, _)) => (**a).clone(),
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_ => panic!("Invalid fas pattern")
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}
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}
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pub fn main() {
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fas(&Noun::Cell(box Noun::Atom(2), box Noun::Cell(box Noun::Atom(2), box Noun::Atom(3))));
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}
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