| use rustc::hir; |
| use rustc::hir::itemlikevisit::ItemLikeVisitor; |
| use rustc::ty::TyCtxt; |
| |
| pub fn test_variance<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) { |
| tcx.hir().krate().visit_all_item_likes(&mut VarianceTest { tcx }); |
| } |
| |
| struct VarianceTest<'a, 'tcx: 'a> { |
| tcx: TyCtxt<'a, 'tcx, 'tcx> |
| } |
| |
| impl<'a, 'tcx> ItemLikeVisitor<'tcx> for VarianceTest<'a, 'tcx> { |
| fn visit_item(&mut self, item: &'tcx hir::Item) { |
| let item_def_id = self.tcx.hir().local_def_id(item.id); |
| |
| // For unit testing: check for a special "rustc_variance" |
| // attribute and report an error with various results if found. |
| if self.tcx.has_attr(item_def_id, "rustc_variance") { |
| let variances_of = self.tcx.variances_of(item_def_id); |
| span_err!(self.tcx.sess, |
| item.span, |
| E0208, |
| "{:?}", |
| variances_of); |
| } |
| } |
| |
| fn visit_trait_item(&mut self, _: &'tcx hir::TraitItem) { } |
| fn visit_impl_item(&mut self, _: &'tcx hir::ImplItem) { } |
| } |