Recompile unit with potential conflict/dependency on some top-level symbol.

compiler/java/com/google/dart/compiler/parser/ParserErrorCode.java

 package com.google.dart.compiler.parser;
 
 import com.google.dart.compiler.ErrorCode;
 import com.google.dart.compiler.ErrorSeverity;
 import com.google.dart.compiler.SubSystem;
 
 /**
  * {@link ErrorCode}s for parser.
  * <p>
  * The convention in this file (with some exceptions) is that the enumeration name matches at least
@@ skipping 92 matching lines @@
 
   @Override
   public ErrorSeverity getErrorSeverity() {
     return severity;
   }
 
   @Override
   public SubSystem getSubSystem() {
     return SubSystem.PARSER;
   }
+
+  @Override
+  public boolean needsRecompilation() {
+    return true;
+  }
 }