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Improve the vec![...] macro with UFCS.
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.
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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT | ||
// file at the top-level directory of this distribution and at | ||
// http://rust-lang.org/COPYRIGHT. | ||
// | ||
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | ||
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | ||
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | ||
// option. This file may not be copied, modified, or distributed | ||
// except according to those terms. | ||
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fn one() -> i32 { 1 } | ||
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// Make sure the vec![...] macro doesn't introduce hidden rvalue | ||
// scopes (such as blocks) around the element expressions. | ||
pub fn main() { | ||
assert_eq!(vec![&one(), &one(), &2], vec![&1, &1, &(one()+one())]); | ||
assert_eq!(vec![&one(); 2], vec![&1, &one()]); | ||
} |