32 lines
1.0 KiB
Rust
32 lines
1.0 KiB
Rust
use errors::struct_span_err;
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use rustc::ty::TyCtxt;
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use rustc_hir as hir;
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use rustc_hir::itemlikevisit::ItemLikeVisitor;
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use rustc_span::symbol::sym;
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use rustc_error_codes::*;
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pub fn test_variance(tcx: TyCtxt<'_>) {
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tcx.hir().krate().visit_all_item_likes(&mut VarianceTest { tcx });
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}
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struct VarianceTest<'tcx> {
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tcx: TyCtxt<'tcx>,
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}
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impl ItemLikeVisitor<'tcx> for VarianceTest<'tcx> {
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fn visit_item(&mut self, item: &'tcx hir::Item<'tcx>) {
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let item_def_id = self.tcx.hir().local_def_id(item.hir_id);
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// For unit testing: check for a special "rustc_variance"
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// attribute and report an error with various results if found.
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if self.tcx.has_attr(item_def_id, sym::rustc_variance) {
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let variances_of = self.tcx.variances_of(item_def_id);
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struct_span_err!(self.tcx.sess, item.span, E0208, "{:?}", variances_of).emit();
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}
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}
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fn visit_trait_item(&mut self, _: &'tcx hir::TraitItem<'tcx>) {}
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fn visit_impl_item(&mut self, _: &'tcx hir::ImplItem<'tcx>) {}
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}
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