Throw exception if variable is unbound

1 files changed, 12 insertions, 0 deletions

diff --git a/src/main/java/org/zwobble/couscous/interpreter/UnboundVariable.java b/src/main/java/org/zwobble/couscous/interpreter/UnboundVariable.java
new file mode 100644
index 0000000..c4aebfb
--- /dev/null
+++ b/src/main/java/org/zwobble/couscous/interpreter/UnboundVariable.java
@@ -0,0 +1,12 @@
+package org.zwobble.couscous.interpreter;
+
+import lombok.EqualsAndHashCode;
+import lombok.Value;
+
+@Value
+@EqualsAndHashCode(callSuper=false)
+public class UnboundVariable extends InterpreterException {
+    private static final long serialVersionUID = 1L;
+    
+    int variableId;
+}