use `TypingEnv` when no `infcx` is available

the behavior of the type system not only depends on the current
assumptions, but also the currentnphase of the compiler. This is
mostly necessary as we need to decide whether and how to reveal
opaque types. We track this via the `TypingMode`.

1 files changed, 2 insertions, 2 deletions

diff --git a/compiler/rustc_middle/src/mir/statement.rs b/compiler/rustc_middle/src/mir/statement.rs
index 88ed90c3114..1ce735cec63 100644
--- a/compiler/rustc_middle/src/mir/statement.rs
+++ b/compiler/rustc_middle/src/mir/statement.rs
@@ -332,9 +332,9 @@ impl<'tcx> Operand<'tcx> {
         span: Span,
     ) -> Operand<'tcx> {
         debug_assert!({
-            let param_env_and_ty = ty::ParamEnv::empty().and(ty);
+            let typing_env = ty::TypingEnv::fully_monomorphized();
             let type_size = tcx
-                .layout_of(param_env_and_ty)
+                .layout_of(typing_env.as_query_input(ty))
                 .unwrap_or_else(|e| panic!("could not compute layout for {ty:?}: {e:?}"))
                 .size;
             let scalar_size = match val {