compiler/rustc_hir_analysis/src/variance/test.rs

   1 use rustc_errors::struct_span_err;
   2 use rustc_middle::ty::TyCtxt;
   3 use rustc_span::symbol::sym;
   4
   5 pub fn test_variance(tcx: TyCtxt<'_>) {
   6     // For unit testing: check for a special "rustc_variance"
   7     // attribute and report an error with various results if found.
   8     for id in tcx.hir().items() {
   9         if tcx.has_attr(id.owner_id.to_def_id(), sym::rustc_variance) {
  10             let variances_of = tcx.variances_of(id.owner_id);
  11             struct_span_err!(tcx.sess, tcx.def_span(id.owner_id), E0208, "{:?}", variances_of)
  12                 .emit();
  13         }
  14     }
  15 }