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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 @@ impl SyntaxExtension {
attrs: &[ast::Attribute], attrs: &[ast::Attribute],
) -> SyntaxExtension { ) -> SyntaxExtension {
let allow_internal_unstable = 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; let mut local_inner_macros = false;
if let Some(macro_export) = sess.find_by_name(attrs, sym::macro_export) { if let Some(macro_export) = sess.find_by_name(attrs, sym::macro_export) {
@ -779,7 +779,8 @@ impl SyntaxExtension {
SyntaxExtension { SyntaxExtension {
kind, kind,
span, 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), allow_internal_unsafe: sess.contains_name(attrs, sym::allow_internal_unsafe),
local_inner_macros, local_inner_macros,
stability, stability,