I know, lets have a more detailed error message when expand fails than just "expand failed"

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@552475 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/Expand.java

@@ -144,7 +144,8 @@ public class Expand extends Task {
 
             log("expand complete", Project.MSG_VERBOSE);
         } catch (IOException ioe) {
-            throw new BuildException("Error while expanding " + srcF.getPath(),
+            throw new BuildException("Error while expanding " + srcF.getPath()
+                    +"\n"+ioe.toString(),
                                      ioe);
         } finally {
             ZipFile.closeQuietly(zf);