bd01175234
This also calls the right API, which e.g. prevents a suggestion for #![feature(unboxed_closures)] on stable. Fixes #26970
31 lines
878 B
Rust
31 lines
878 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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// Check that parenthetical notation is feature-gated except with the
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// `Fn` traits.
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use std::marker;
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trait Foo<A> {
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type Output;
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fn dummy(&self, a: A) { }
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}
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fn main() {
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let x: Box<Foo(isize)>;
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//~^ ERROR parenthetical notation is only stable when used with `Fn`-family
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// No errors with these:
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let x: Box<Fn(isize)>;
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let x: Box<FnMut(isize)>;
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let x: Box<FnOnce(isize)>;
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}
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