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Rollup merge of #70632 - tspiteri:vec-new, r=sfackler 

expand vec![] to Vec::new()

The current expansion of `vec![]` calls `into_vec` on a boxed slice, which results in longer IR, and even after optimization, some unwinding artifacts are still present in the IR. This PR uses `Vec::new()` for `vec![]`.

This also allows `vec![]` to be used in const expressions.
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Dylan DPC 2020-04-01 00:27:26 +02:00 committed by GitHub
parent 0979a2871c 4d8273dea5
commit 8310320ebd
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6
src/liballoc/macros.rs
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@ -36,6 +36,9 @@
#[stable(feature = "rust1", since = "1.0.0")]
#[allow_internal_unstable(box_syntax)]
macro_rules! vec {
() => (
$crate::vec::Vec::new()
);
($elem:expr; $n:expr) => (
$crate::vec::from_elem($elem, $n)
);
@ -51,6 +54,9 @@ macro_rules! vec {
// NB see the slice::hack module in slice.rs for more information
#[cfg(test)]
macro_rules! vec {
() => (
$crate::vec::Vec::new()
);
($elem:expr; $n:expr) => (
$crate::vec::from_elem($elem, $n)
);