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Auto merge of #58098 - oli-obk:maybe_allow_internal_unstable, r=petrochenkov

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Require a list of features in `#[allow_internal_unstable]`

The blanket-permission slip is not great and will likely give us trouble some point down the road.
This commit is contained in:
bors 2019-02-12 12:10:10 +00:00
commit c84e797642
41 changed files with 622 additions and 512 deletions
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8
src/libsyntax_pos/lib.rs
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@ -386,9 +386,13 @@ impl Span {
/// Check if a span is "internal" to a macro in which `#[unstable]`
/// items can be used (that is, a macro marked with
/// `#[allow_internal_unstable]`).
pub fn allows_unstable(&self) -> bool {
pub fn allows_unstable(&self, feature: &str) -> bool {
match self.ctxt().outer().expn_info() {
Some(info) => info.allow_internal_unstable,
Some(info) => info
.allow_internal_unstable
.map_or(false, |features| features.iter().any(|&f|
f == feature || f == "allow_internal_unstable_backcompat_hack"
)),
None => false,
}
}