bjoernager/rust
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auto merge of #12753 : huonw/rust/vec-macro, r=cmr

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If no arguments are given to `vec!` then no pushes are emitted and
so the compiler (rightly) complains that the mutability of `temp` is
never used.

This behaviour is rather annoying for users.
This commit is contained in:
bors 2014-03-07 02:51:39 -08:00
commit 33768c46ec
1 changed files with 5 additions and 3 deletions
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8
src/libstd/macros.rs
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@ -366,12 +366,14 @@ macro_rules! try(
($e:expr) => (match $e { Ok(e) => e, Err(e) => return Err(e) }) ($e:expr) => (match $e { Ok(e) => e, Err(e) => return Err(e) })
) )
/// Create a `std::vec_ng::Vec` containing the arguments.
#[macro_export] #[macro_export]
macro_rules! vec( macro_rules! vec(
($($e:expr),*) => ({ ($($e:expr),*) => ({
let mut temp = ::std::vec_ng::Vec::new(); // leading _ to allow empty construction without a warning.
$(temp.push($e);)* let mut _temp = ::std::vec_ng::Vec::new();
temp $(_temp.push($e);)*
_temp
}) })
) )