don't swallow original exception. PR 34633.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@703192 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/optional/ReplaceRegExp.java

@@ -447,7 +447,7 @@ public class ReplaceRegExp extends Task {
                     temp = null;
                 } catch (IOException e) {
                     throw new BuildException("Couldn't rename temporary file "
-                                             + temp, getLocation());
+                                             + temp, e, getLocation());
                 }
             } else {
                 log("No change made", Project.MSG_DEBUG);