Add a mir validation check to prevent OpaqueCast after analysis passes finish

2023-09-27 11:35:09 +00:00
parent 2d4201f7c6
commit 0031cf7c7e
2 changed files with 9 additions and 0 deletions
--- a/compiler/rustc_const_eval/src/transform/validate.rs
+++ b/compiler/rustc_const_eval/src/transform/validate.rs
@@ -633,6 +633,14 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
        location: Location,
    ) {
        match elem {
+            ProjectionElem::OpaqueCast(ty)
+                if self.mir_phase >= MirPhase::Runtime(RuntimePhase::Initial) =>
+            {
+                self.fail(
+                    location,
+                    format!("explicit opaque type cast to `{ty}` after `RevealAll`"),
+                )
+            }
            ProjectionElem::Index(index) => {
                let index_ty = self.body.local_decls[index].ty;
                if index_ty != self.tcx.types.usize {