b: ty::Region<'tcx>,
) -> RelateResult<'tcx, ty::Region<'tcx>> {
debug!("{}.regions({:?}, {:?})", self.tag(), a, b);
- let origin = Subtype(box self.fields.trace.clone());
+ let origin = Subtype(Box::new(self.fields.trace.clone()));
self.fields
.infcx
.inner