1 files changed, 9 insertions, 0 deletions
diff --git a/mrblib/io.rb b/mrblib/io.rb
index c838b96e5..4d2fda5f3 100644
--- a/mrblib/io.rb
+++ b/mrblib/io.rb
@@ -108,6 +108,11 @@ class IO
     raise IOError
   end
 
+  def <<(str)
+    write(str)
+    self
+  end
+
   def eof?
     return true if @buf && @buf.size > 0
 
@@ -136,6 +141,10 @@ class IO
     seek(i, SEEK_SET)
   end
 
+  def rewind
+    seek(0, SEEK_SET)
+  end
+
   def seek(i, whence = SEEK_SET)
     raise IOError if closed?
     @pos = sysseek(i, whence)