Version 3.0.2.

include/v8-preparser.h

Index: include/v8-preparser.h
diff --git a/include/v8-preparser.h b/include/v8-preparser.h
index 9425f7d46725a1b64dda1b622cbe9b5634b082a7..68ce50223ec51c1b725ef1db298d2b7a8cc79c16 100644
--- a/include/v8-preparser.h
+++ b/include/v8-preparser.h
@@ -99,6 +99,13 @@ class UnicodeInputStream {
   // Returns the next Unicode code-point in the input, or a negative value when
   // there is no more input in the stream.
   virtual int32_t Next() = 0;
+
+  // Pushes a read character back into the stream, so that it will be the next
+  // to be read by Advance(). The character pushed back must be the most
+  // recently read character that hasn't already been pushed back (i.e., if
+  // pushing back more than one character, they must occur in the opposite order
+  // of the one they were read in).
+  virtual void PushBack(int32_t ch) = 0;
 };