rust-lang · Jun 11, 2024
diff --git a/‎compiler/rustc_ast_lowering/src/delegation.rs
+3-1 b/‎compiler/rustc_ast_lowering/src/delegation.rs
+3-1
diff --git a/‎compiler/rustc_const_eval/src/interpret/cast.rs
+7-3 b/‎compiler/rustc_const_eval/src/interpret/cast.rs
+7-3
@@ -67,7 +67,9 @@ impl<'hir> LoweringContext<'_, 'hir> {
             return false;
         };
         if let Some(local_sig_id) = sig_id.as_local() {
-            self.resolver.delegation_fn_sigs[&local_sig_id].has_self
+            // The value may be missing due to recursive delegation.
+            // Error will be emmited later during HIR ty lowering.
+            self.resolver.delegation_fn_sigs.get(&local_sig_id).map_or(false, |sig| sig.has_self)
         } else {
             match self.tcx.def_kind(sig_id) {
                 DefKind::Fn => false,
 
@@ -274,9 +274,13 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
         // Let's make sure v is sign-extended *if* it has a signed type.
         let signed = src_layout.abi.is_signed(); // Also asserts that abi is `Scalar`.
 
-        let v = scalar.to_bits(src_layout.size)?;
-        let v = if signed { self.sign_extend(v, src_layout) } else { v };
-        trace!("cast_from_scalar: {}, {} -> {}", v, src_layout.ty, cast_ty);
+        let v = match src_layout.ty.kind() {
+            Uint(_) | RawPtr(..) | FnPtr(..) => scalar.to_uint(src_layout.size)?,
+            Int(_) => scalar.to_int(src_layout.size)? as u128, // we will cast back to `i128` below if the sign matters
+            Bool => scalar.to_bool()?.into(),
+            Char => scalar.to_char()?.into(),
+            _ => span_bug!(self.cur_span(), "invalid int-like cast from {}", src_layout.ty),
+        };
 
         Ok(match *cast_ty.kind() {
             // int -> int