remove LikeARoseTree

compiler/gen_llvm/src/llvm/build.rs

@@ -1440,12 +1440,6 @@ pub fn build_exp_expr<'a, 'ctx, 'env>(
             structure,
             wrapped: Wrapped::RecordOrSingleTagUnion,
             ..
-        }
-        | AccessAtIndex {
-            index,
-            structure,
-            wrapped: Wrapped::LikeARoseTree,
-            ..
         } => {
             // extract field from a record
             match load_symbol_and_layout(scope, structure) {

compiler/mono/src/alias_analysis.rs

@@ -896,10 +896,6 @@ fn expr_spec(
                 Wrapped::RecordOrSingleTagUnion => {
                     builder.add_get_tuple_field(block, value_id, *index as u32)
                 }
-                Wrapped::LikeARoseTree => {
-                    let result_type = layout_spec(builder, layout)?;
-                    builder.add_unknown_with(block, &[value_id], result_type)
-                }
             }
         }
         Array { elem_layout, elems } => {

compiler/mono/src/ir.rs

@@ -1019,8 +1019,6 @@ pub enum Wrapped {
     EmptyRecord,
     SingleElementRecord,
     RecordOrSingleTagUnion,
-    /// Like a rose tree; recursive, but only one tag
-    LikeARoseTree,
 }
 
 impl Wrapped {
@@ -1058,7 +1056,7 @@ impl Wrapped {
                             unreachable!()
                         }
                     },
-                    NonNullableUnwrapped(_) => Some(Wrapped::LikeARoseTree),
+                    NonNullableUnwrapped(_) => unreachable!(),
 
                     NullableWrapped { .. } | NullableUnwrapped { .. } => {
                         unreachable!();