From 0c12bb7771537380a22083a8d0dd6df46a95bb99 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Tue, 6 Oct 2015 17:41:14 +0100
Subject: Throw error if field is unbound

---
 .../zwobble/couscous/interpreter/values/ObjectInterpreterValue.java   | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'src/main/java/org/zwobble/couscous/interpreter/values/ObjectInterpreterValue.java')

diff --git a/src/main/java/org/zwobble/couscous/interpreter/values/ObjectInterpreterValue.java b/src/main/java/org/zwobble/couscous/interpreter/values/ObjectInterpreterValue.java
index b6a1e87..03e8061 100644
--- a/src/main/java/org/zwobble/couscous/interpreter/values/ObjectInterpreterValue.java
+++ b/src/main/java/org/zwobble/couscous/interpreter/values/ObjectInterpreterValue.java
@@ -6,6 +6,7 @@ import java.util.Optional;
 
 import org.zwobble.couscous.interpreter.InterpreterTypes;
 import org.zwobble.couscous.interpreter.NoSuchField;
+import org.zwobble.couscous.interpreter.UnboundField;
 import org.zwobble.couscous.values.PrimitiveValue;
 
 import lombok.val;
@@ -31,10 +32,11 @@ public class ObjectInterpreterValue implements InterpreterValue {
 
     @Override
     public InterpreterValue getField(String fieldName) {
+        type.getField(fieldName).orElseThrow(() -> new NoSuchField(fieldName));
         if (fields.containsKey(fieldName)) {
             return fields.get(fieldName);            
         } else {
-            throw new NoSuchField(fieldName);
+            throw new UnboundField(fieldName);
         }
     }
 
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