blob: b5195826b8631a4a6278660107442ff309c14590 [file] [log] [blame]
use rustc::hir;
use rustc::hir::itemlikevisit::ItemLikeVisitor;
use rustc::ty::TyCtxt;
use syntax::symbol::sym;
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_from_hir_id(item.hir_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, sym::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) { }
}