1 files changed, 15 insertions, 0 deletions
diff --git a/compiler/rustc_hir_analysis/src/variance/test.rs b/compiler/rustc_hir_analysis/src/variance/test.rs
index d57d05d76..d98dc0e6b 100644
--- a/compiler/rustc_hir_analysis/src/variance/test.rs
+++ b/compiler/rustc_hir_analysis/src/variance/test.rs
@@ -1,9 +1,24 @@
+use rustc_hir::def::DefKind;
+use rustc_hir::def_id::CRATE_DEF_ID;
 use rustc_middle::ty::TyCtxt;
 use rustc_span::symbol::sym;
 
 use crate::errors;
 
 pub fn test_variance(tcx: TyCtxt<'_>) {
+    if tcx.has_attr(CRATE_DEF_ID, sym::rustc_variance_of_opaques) {
+        for id in tcx.hir().items() {
+            if matches!(tcx.def_kind(id.owner_id), DefKind::OpaqueTy) {
+                let variances_of = tcx.variances_of(id.owner_id);
+
+                tcx.sess.emit_err(errors::VariancesOf {
+                    span: tcx.def_span(id.owner_id),
+                    variances_of: format!("{variances_of:?}"),
+                });
+            }
+        }
+    }
+
     // 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() {