From ff8d77b3c33369a4971eba7f7e75385217ded374 Mon Sep 17 00:00:00 2001
From: Ed Willink
Date: Sun, 24 May 2020 10:58:05 +0100
Subject: [unrelated] Fix warning

---
 .../eclipse/qvtd/runtime/evaluation/InvocationFailedException.java    | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/plugins/org.eclipse.qvtd.runtime/src/org/eclipse/qvtd/runtime/evaluation/InvocationFailedException.java b/plugins/org.eclipse.qvtd.runtime/src/org/eclipse/qvtd/runtime/evaluation/InvocationFailedException.java
index fbed6e4ab..4e3d7747a 100644
--- a/plugins/org.eclipse.qvtd.runtime/src/org/eclipse/qvtd/runtime/evaluation/InvocationFailedException.java
+++ b/plugins/org.eclipse.qvtd.runtime/src/org/eclipse/qvtd/runtime/evaluation/InvocationFailedException.java
@@ -31,7 +31,7 @@ public class InvocationFailedException extends InvalidValueException
 	}
 
 	@Override
-	public String toString() {
-		return slotState.toString();
+	public @NonNull String toString() {
+		return String.valueOf(slotState);
 	}
 }
\ No newline at end of file
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