user/src/com/google/gwt/core/CoreWithUserAgent.gwt.xml

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<!-- Copyright 2009 Google Inc.                                             -->
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<!-- http://www.apache.org/licenses/LICENSE-2.0                             -->
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<!-- Deferred binding rules for core classes based on user agent. -->
<module>
  <inherits name="com.google.gwt.core.Core"/>

  <replace-with class="com.google.gwt.core.client.impl.StackTraceCreator.CollectorChrome">
    <when-type-is class="com.google.gwt.core.client.impl.StackTraceCreator.Collector" />
    <when-property-is name="compiler.stackMode" value="native" />
    <!-- For now, only Chrome provides Error.stack support, so we hijack the
         entire WebKit permutation -->
    <when-property-is name="user.agent" value="safari" />
  </replace-with>

  <replace-with class="com.google.gwt.core.client.impl.StackTraceCreator.CollectorMoz">
    <when-type-is class="com.google.gwt.core.client.impl.StackTraceCreator.Collector" />
    <when-property-is name="compiler.stackMode" value="native" />
    <when-property-is name="user.agent" value="gecko1_8" />
  </replace-with>

  <replace-with class="com.google.gwt.core.client.impl.StackTraceCreator.CollectorOpera">
    <when-type-is class="com.google.gwt.core.client.impl.StackTraceCreator.Collector" />
    <when-property-is name="compiler.stackMode" value="native" />
    <any>
      <when-property-is name="user.agent" value="opera" />
    </any>
  </replace-with>
  
  <replace-with
      class="com.google.gwt.core.client.impl.StackTraceCreator.CollectorNull">
    <when-type-is class="com.google.gwt.core.client.impl.StackTraceCreator.Collector" />
    <when-property-is name="compiler.stackMode" value="strip" />
  </replace-with>
</module>