--- jsr166/build.xml	2018/01/20 01:54:14	1.261
+++ jsr166/build.xml	2018/01/23 04:59:10	1.262
@@ -1474,7 +1474,7 @@
   </target>
 
   <!-- ant -emacs errorprone-jtreg |& grep -EA1 '(warning|error):' -->
-  <!-- -XDcompilePolicy=simple or by-file avoids confusing UnusedImports -->
+  <!-- -XDcompilePolicy=simple or byfile avoids confusing UnusedImports -->
   <target name="errorprone-jtreg"
           depends="jar"
           description="Run errorprone over jtreg tests (experimental)">
@@ -1485,7 +1485,7 @@
        classes="${product.jar}"
        verbose="all">
       <jtreg-elements>
-        <arg value="-javacoption:-XDcompilePolicy=simple"/>
+        <arg value="-javacoption:-XDcompilePolicy=byfile"/>
         <arg value="-javacoption:-processorpath"/>
         <arg value="-javacoption:${errorprone.jar}"/>
         <arg value="-javacoption:-Xplugin:ErrorProne