From dfd9fa96c9fd4c9ab25de51bedaf219b280376f5 Mon Sep 17 00:00:00 2001
From: Sebastian Zarnekow <Sebastian.Zarnekow@itemis.de>
Date: Mon, 2 Apr 2012 22:38:11 +0200
Subject: [PATCH] [validation] Improved error message for invalid attempt to
 create a FeatureBasedDiagnostic

---
 .../org/eclipse/xtext/validation/FeatureBasedDiagnostic.java    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugins/org.eclipse.xtext/src/org/eclipse/xtext/validation/FeatureBasedDiagnostic.java b/plugins/org.eclipse.xtext/src/org/eclipse/xtext/validation/FeatureBasedDiagnostic.java
index 45be8d305..2c2baa831 100644
--- a/plugins/org.eclipse.xtext/src/org/eclipse/xtext/validation/FeatureBasedDiagnostic.java
+++ b/plugins/org.eclipse.xtext/src/org/eclipse/xtext/validation/FeatureBasedDiagnostic.java
@@ -30,7 +30,7 @@ public class FeatureBasedDiagnostic extends AbstractValidationDiagnostic {
 		super(severity, message, source, checkType, issueCode, issueData);
 		if (feature != null && source != null) {
 			if (source.eClass().getEStructuralFeature(feature.getName()) != feature) {
-				throw new IllegalArgumentException("EClass '" + source.eClass().getName() + "' does not expose a feature '" + feature.getName() + "'");
+				throw new IllegalArgumentException("The sources EClass '" + source.eClass().getName() + "' does not expose the feature '" + feature.getEContainingClass().getName() + "." + feature.getName() + "'");
 			}
 		}
 		this.feature = feature;