diff --git a/src/ast2/mod.rs b/src/ast2/mod.rs
index 0e9b4f6..fe89e6b 100644
--- a/src/ast2/mod.rs
+++ b/src/ast2/mod.rs
@@ -86,6 +86,8 @@ pub enum Tag {
     AddressOf,
     Not,
     Negate,
+    PlaceToValueConversion,
+    ValueToPlaceConversion,
     /// data is two indices for `lhs` and `rhs`
     Or,
     And,
@@ -370,6 +372,8 @@ impl From<(Tag, Data)> for ExpandedData {
             | Tag::AddressOf
             | Tag::Not
             | Tag::Negate
+            | Tag::PlaceToValueConversion
+            | Tag::ValueToPlaceConversion
             | Tag::ExprStmt => Self::from_index(data),
             Tag::FieldAccess
             | Tag::DeclRefUnresolved
@@ -1370,7 +1374,9 @@ impl Ast {
                 // TODO: find out of the expression is const, volatile for flags
                 ip.try_get_pointer_type(ty, None).unwrap()
             }
-            Tag::Not | Tag::Negate => self.get_type_of_node(ip, cache, data.as_index()),
+            Tag::ValueToPlaceConversion | Tag::PlaceToValueConversion | Tag::Not | Tag::Negate => {
+                self.get_type_of_node(ip, cache, data.as_index())
+            }
             Tag::Or
             | Tag::And
             | Tag::BitOr
@@ -1494,7 +1500,12 @@ impl Ast {
                 let (a, _) = data.as_index_intern();
                 vec![a]
             }
-            Tag::Deref | Tag::AddressOf | Tag::Not | Tag::Negate => {
+            Tag::ValueToPlaceConversion
+            | Tag::PlaceToValueConversion
+            | Tag::Deref
+            | Tag::AddressOf
+            | Tag::Not
+            | Tag::Negate => {
                 let a = data.as_index();
                 vec![a]
             }
@@ -4471,10 +4482,6 @@ pub trait AstVisitorTrait {
         _ = (ast, idx);
         Err(Self::UNIMPL)
     }
-    fn visit_return_expr(&mut self, ast: &mut Ast, idx: Index) -> Result<Self::Value, Self::Error> {
-        _ = (ast, idx);
-        Err(Self::UNIMPL)
-    }
     fn visit_global_decl(&mut self, ast: &mut Ast, idx: Index) -> Result<Self::Value, Self::Error> {
         _ = (ast, idx);
         Err(Self::UNIMPL)
@@ -5501,6 +5508,8 @@ pub mod irgen {
                         Tag::IfElseExpr => todo!(),
                         Tag::Error => todo!(),
                         Tag::Undefined => todo!(),
+                        Tag::PlaceToValueConversion => todo!(),
+                        Tag::ValueToPlaceConversion => todo!(),
                     }
                 },
                 |ast, scopes, i, tag, data| {
@@ -5569,6 +5578,8 @@ pub mod irgen {
                         Tag::IfElseExpr => todo!(),
                         Tag::Error => todo!(),
                         Tag::Undefined => todo!(),
+                        Tag::PlaceToValueConversion => todo!(),
+                        Tag::ValueToPlaceConversion => todo!(),
                     }
                 },
             );