df93deab10
- add feature gate - add basic tests - adjust parser to eliminate conflict between `const fn` and associated constants - allow `const fn` in traits/trait-impls, but forbid later in type check - correct some merge conflicts
24 lines
678 B
Rust
24 lines
678 B
Rust
// Copyright 2015 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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// Test a call whose argument is the result of another call.
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#![feature(const_fn)]
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const fn sub(x: u32, y: u32) -> u32 {
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x - y
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}
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const X: u32 = sub(sub(88, 44), 22);
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fn main() {
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assert_eq!(X, 22);
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}
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