2 files changed, 7 insertions, 2 deletions

diff --git a/src/main/java/lv/enes/orang/NonEmptyList.java b/src/main/java/lv/enes/orang/NonEmptyList.java
index b532a18..860db28 100644
--- a/src/main/java/lv/enes/orang/NonEmptyList.java
+++ b/src/main/java/lv/enes/orang/NonEmptyList.java
@@ -1,13 +1,18 @@
 package lv.enes.orang;
 
+import lombok.EqualsAndHashCode;
+
 import java.util.AbstractList;
 import java.util.List;
 
+@EqualsAndHashCode(callSuper = true)
 public class NonEmptyList<E> extends AbstractList<E> {
         private final List<E> delegate;
 
         public NonEmptyList(List<E> delegate) {
-                assert !delegate.isEmpty();
+                if (delegate.isEmpty()) {
+                        throw new IllegalArgumentException("Empty list");
+                }
                 this.delegate = List.copyOf(delegate);
         }
 
diff --git a/src/main/java/lv/enes/orang/ast/Statement.java b/src/main/java/lv/enes/orang/ast/Statement.java
index 62b76bd..0f52fc3 100644
--- a/src/main/java/lv/enes/orang/ast/Statement.java
+++ b/src/main/java/lv/enes/orang/ast/Statement.java
@@ -4,5 +4,5 @@ import lv.enes.orang.OrangRuntimeException;
 import lv.enes.orang.Scope;
 
 public interface Statement {
-        Scope runStatement(Scope scope) throws OrangRuntimeException, OrangRuntimeException;
+        Scope runStatement(Scope scope) throws OrangRuntimeException;
 }