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use rustc_errors::struct_span_err;
use rustc_middle::ty::TyCtxt;
use rustc_span::symbol::sym;
pub fn test_variance(tcx: TyCtxt<'_>) {
// For unit testing: check for a special "rustc_variance"
// attribute and report an error with various results if found.
for id in tcx.hir().items() {
if tcx.has_attr(id.def_id.to_def_id(), sym::rustc_variance) {
let variances_of = tcx.variances_of(id.def_id);
struct_span_err!(tcx.sess, tcx.def_span(id.def_id), E0208, "{:?}", variances_of).emit();
}
}
}
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