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expand: Do not allocate Lrc for allow_internal_unstable list unless necessary

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This commit is contained in:
Vadim Petrochenkov 2021-02-23 01:38:36 +03:00
parent a15f484b91
commit ddd20ef8cb
1 changed files with 3 additions and 2 deletions
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5
compiler/rustc_expand/src/base.rs
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@ -757,7 +757,7 @@ pub fn new(
attrs: &[ast::Attribute],
) -> SyntaxExtension {
let allow_internal_unstable =
Some(attr::allow_internal_unstable(sess, &attrs).collect::<Vec<Symbol>>().into());
attr::allow_internal_unstable(sess, &attrs).collect::<Vec<Symbol>>();
let mut local_inner_macros = false;
if let Some(macro_export) = sess.find_by_name(attrs, sym::macro_export) {
@ -779,7 +779,8 @@ pub fn new(
SyntaxExtension {
kind,
span,
allow_internal_unstable,
allow_internal_unstable: (!allow_internal_unstable.is_empty())
.then(|| allow_internal_unstable.into()),
allow_internal_unsafe: sess.contains_name(attrs, sym::allow_internal_unsafe),
local_inner_macros,
stability,