Improve robust: Check type before casting

(cherry picked from commit 947aed9)


Project: http://git-wip-us.apache.org/repos/asf/groovy/repo
Commit: http://git-wip-us.apache.org/repos/asf/groovy/commit/66bba437
Tree: http://git-wip-us.apache.org/repos/asf/groovy/tree/66bba437
Diff: http://git-wip-us.apache.org/repos/asf/groovy/diff/66bba437

Branch: refs/heads/GROOVY_2_6_X
Commit: 66bba437b96fd305431ca93521b2d1faa0ad43e9
Parents: ac6e37d
Author: sunlan <[email protected]>
Authored: Thu Dec 21 08:22:37 2017 +0800
Committer: sunlan <[email protected]>
Committed: Thu Dec 21 08:53:58 2017 +0800

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 src/main/java/org/codehaus/groovy/classgen/asm/MopWriter.java | 4 ++++
 1 file changed, 4 insertions(+)
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http://git-wip-us.apache.org/repos/asf/groovy/blob/66bba437/src/main/java/org/codehaus/groovy/classgen/asm/MopWriter.java
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diff --git a/src/main/java/org/codehaus/groovy/classgen/asm/MopWriter.java 
b/src/main/java/org/codehaus/groovy/classgen/asm/MopWriter.java
index 4f8f48c..0781108 100644
--- a/src/main/java/org/codehaus/groovy/classgen/asm/MopWriter.java
+++ b/src/main/java/org/codehaus/groovy/classgen/asm/MopWriter.java
@@ -69,6 +69,10 @@ public class MopWriter {
         }
 
         public boolean equals(Object obj) {
+            if (!(obj instanceof MopKey)) {
+                return false;
+            }
+
             MopKey other = (MopKey) obj;
             return other.name.equals(name) && 
equalParameterTypes(other.params,params);
         }

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