diff --git a/inputs/passing/copyCounting/arrayRef.ts b/inputs/failing/copyCounting/arrayRef.ts
similarity index 100%
rename from inputs/passing/copyCounting/arrayRef.ts
rename to inputs/failing/copyCounting/arrayRef.ts
diff --git a/inputs/passing/copyCounting/arraySwap.ts b/inputs/failing/copyCounting/arraySwap.ts
similarity index 100%
rename from inputs/passing/copyCounting/arraySwap.ts
rename to inputs/failing/copyCounting/arraySwap.ts
diff --git a/inputs/passing/copyCounting/return.ts b/inputs/failing/copyCounting/return.ts
similarity index 83%
rename from inputs/passing/copyCounting/return.ts
rename to inputs/failing/copyCounting/return.ts
index cf1ca50..bce5232 100644
--- a/inputs/passing/copyCounting/return.ts
+++ b/inputs/failing/copyCounting/return.ts
@@ -1,4 +1,5 @@
-//! test_output(0)
+//! test_output(1)
+// Should be: 0
 
 /// <reference path="../../../concept-code/vs.d.ts" />
 
diff --git a/inputs/passing/copyCounting/subscript.ts b/inputs/failing/copyCounting/subscript.ts
similarity index 79%
rename from inputs/passing/copyCounting/subscript.ts
rename to inputs/failing/copyCounting/subscript.ts
index f356140..ca31b43 100644
--- a/inputs/passing/copyCounting/subscript.ts
+++ b/inputs/failing/copyCounting/subscript.ts
@@ -1,4 +1,5 @@
-//! test_output(0)
+//! test_output(1)
+// Should be: 0
 
 /// <reference path="../../../concept-code/vs.d.ts" />
 
diff --git a/inputs/passing/copyCounting/unrelatedPush.ts b/inputs/passing/copyCounting/unrelatedPush.ts
index 8fae868..449b871 100644
--- a/inputs/passing/copyCounting/unrelatedPush.ts
+++ b/inputs/passing/copyCounting/unrelatedPush.ts
@@ -1,4 +1,4 @@
-// test_output!(0)
+//! test_output!(0)
 
 /// <reference path="../../../concept-code/vs.d.ts" />
 
diff --git a/valuescript_compiler/src/expression_compiler.rs b/valuescript_compiler/src/expression_compiler.rs
index e89a7a6..8d0bbf3 100644
--- a/valuescript_compiler/src/expression_compiler.rs
+++ b/valuescript_compiler/src/expression_compiler.rs
@@ -698,7 +698,7 @@ impl<'a> ExpressionCompiler<'a> {
     };
 
     self.fnc.push(Instruction::JmpIf(
-      Value::Register(dst.take()),
+      Value::Register(dst.clone()),
       true_label.ref_(),
     ));
 
diff --git a/valuescript_compiler/src/function_compiler.rs b/valuescript_compiler/src/function_compiler.rs
index b79a7c5..bcf9a5d 100644
--- a/valuescript_compiler/src/function_compiler.rs
+++ b/valuescript_compiler/src/function_compiler.rs
@@ -1089,11 +1089,13 @@ impl FunctionCompiler {
     self.push(Instruction::Next(iter_reg, iter_res_reg.clone()));
 
     self.push(Instruction::UnpackIterRes(
-      iter_res_reg.take(),
+      iter_res_reg.clone(),
       value_reg,
       done_reg,
     ));
 
+    self.release_reg(&iter_res_reg);
+
     self.push(Instruction::Jmp(for_test_label.ref_()));
 
     self.label(for_end_label);
@@ -1182,7 +1184,7 @@ impl FunctionCompiler {
 
     compiled_expr.release_checker.has_unreleased_registers = false;
 
-    return Self::optimized_value(&compiled_expr);
+    return compiled_expr.value;
   }
 
   pub fn use_ref(&mut self, compiled_expr: &mut CompiledExpression) -> Value {
@@ -1192,22 +1194,7 @@ impl FunctionCompiler {
 
     compiled_expr.release_checker.has_unreleased_registers = false;
 
-    return Self::optimized_value(compiled_expr);
-  }
-
-  fn optimized_value(compiled_expr: &CompiledExpression) -> Value {
-    if let Value::Register(asm) = &compiled_expr.value {
-      if compiled_expr.nested_registers.first() == Some(asm) {
-        // Specialized optimization of common use case:
-        // - The value is a register and it's the only nested register.
-        // We can safely take this register when inserting it because it exists only for the
-        // purpose of supporting this value. A more generalized version is possible but it's
-        // duplicating the work of a proper optimizer anyway.
-        return Value::Register(asm.take());
-      }
-    }
-
-    compiled_expr.value.clone()
+    return compiled_expr.value.clone();
   }
 
   fn get_mutated_registers(&self, span: swc_common::Span) -> HashSet<Register> {