Checkpoint

src/prolog/components/terms/Variable.kt

@@ -2,7 +2,7 @@ package prolog.components.terms
 
 import java.util.Optional
 
-data class Variable(val name: String): Term {
+data class Variable(val name: String) : Term {
     private var alias: Optional<Term> = Optional.empty()
 
     fun alias(): Optional<Term> {
@@ -27,4 +27,12 @@ data class Variable(val name: String): Term {
             else -> name
         }
     }
+
+    override fun equals(other: Any?): Boolean {
+        return if (alias.isPresent) {
+            alias.get() == other
+        } else {
+            name == other.toString()
+        }
+    }
 }