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Allow multiple allow_internal_unstable attributes

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Co-authored-by: varkor <github@varkor.com>
This commit is contained in:
Dániel Buga 2020-09-25 14:40:16 +02:00
parent 9d74efe32e
commit 54c9c949a1
4 changed files with 28 additions and 11 deletions
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21
compiler/rustc_attr/src/builtin.rs
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@ -1022,14 +1022,21 @@ pub fn find_transparency(
pub fn allow_internal_unstable<'a>(
sess: &'a Session,
attrs: &[Attribute],
attrs: &'a [Attribute],
) -> Option<impl Iterator<Item = Symbol> + 'a> {
let attr = sess.find_by_name(attrs, sym::allow_internal_unstable)?;
let list = attr.meta_item_list().or_else(|| {
sess.diagnostic()
.span_err(attr.span, "allow_internal_unstable expects list of feature names");
None
})?;
let attrs = sess.filter_by_name(attrs, sym::allow_internal_unstable);
let list = attrs
.filter_map(move |attr| {
attr.meta_item_list().or_else(|| {
sess.diagnostic().span_err(
attr.span,
"`allow_internal_unstable` expects a list of feature names",
);
None
})
})
.flatten();
Some(list.into_iter().filter_map(move |it| {
let name = it.ident().map(|ident| ident.name);
if name.is_none() {