23a553a303
There are two limitations to the macro that this addresses: 1. the expected type is not propagated, coercions don't trigger 2. references inside element expressions don't outlive the `Vec` Both of these limitations are caused by the block in the macro expansion, previously needed to trigger a coercion from `Box<[T; N]>` to `Box<[T]>`, now possible with UFCS.
25 lines
868 B
Rust
25 lines
868 B
Rust
// Copyright 2014-2015 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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/// Creates a `Vec` containing the arguments.
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#[macro_export]
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#[stable]
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macro_rules! vec {
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($x:expr; $y:expr) => (
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<[_] as $crate::slice::SliceExt>::into_vec(
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$crate::boxed::Box::new([$x; $y]))
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);
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($($x:expr),*) => (
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<[_] as $crate::slice::SliceExt>::into_vec(
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$crate::boxed::Box::new([$($x),*]))
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);
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($($x:expr,)*) => (vec![$($x),*])
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}
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