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
27 lines
826 B
Rust
27 lines
826 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 that we can't declare a const fn in an impl -- right now it's
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// just not allowed at all, though eventually it'd make sense to allow
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// it if the trait fn is const (but right now no trait fns can be
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// const).
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#![feature(const_fn)]
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trait Foo {
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fn f() -> u32;
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}
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impl Foo for u32 {
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const fn f() -> u32 { 22 } //~ ERROR E0379
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}
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fn main() { }
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