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Add TyCtxt::is_closure

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This commit is contained in:
Shotaro Yamada 2017-11-11 02:20:53 +09:00
parent c3ec175857
commit ec2ff8f734
3 changed files with 11 additions and 9 deletions
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6
src/librustc/ty/util.rs
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@ -621,9 +621,13 @@ impl<'a, 'gcx, 'tcx> TyCtxt<'a, 'gcx, 'tcx> {
result
}
pub fn is_closure(self, def_id: DefId) -> bool {
self.def_key(def_id).disambiguated_data.data == DefPathData::ClosureExpr
}
pub fn closure_base_def_id(self, def_id: DefId) -> DefId {
let mut def_id = def_id;
while self.def_key(def_id).disambiguated_data.data == DefPathData::ClosureExpr {
while self.is_closure(def_id) {
def_id = self.parent_def_id(def_id).unwrap_or_else(|| {
bug!("closure {:?} has no parent", def_id);
});