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diff --git a/tests/bivalent-stream.impure.lisp b/tests/bivalent-stream.impure.lisp
new file mode 100644
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+++ b/tests/bivalent-stream.impure.lisp
@@ -0,0 +1,37 @@
+;;;; This file is for testing bivalent stream functionality, using
+;;;; test machinery which might have side effects (e.g.  executing
+;;;; DEFUN, writing files).  Note that the tests here might reach into
+;;;; unexported functionality, and should not be used as a guide for
+;;;; users.
+
+;;;; This software is part of the SBCL system. See the README file for
+;;;; more information.
+;;;;
+;;;; While most of SBCL is derived from the CMU CL system, the test
+;;;; files (like this one) were written from scratch after the fork
+;;;; from CMU CL.
+;;;; 
+;;;; This software is in the public domain and is provided with
+;;;; absolutely no warranty. See the COPYING and CREDITS files for
+;;;; more information.
+
+;;; Test character decode restarts.
+(with-open-file (s "bivalent-stream-test.txt" :direction :output
+		 :if-exists :supersede 
+		 :element-type :default :external-format :utf-8)
+  (write-byte 65 s)
+  (write-char #\B s)
+  (write-byte #xe0 s)
+  (write-char #\C s))
+
+(with-open-file (s "bivalent-stream-test.txt" :direction :input
+		 :element-type :default
+		 :external-format :utf-8)
+  (assert (eql (read-char s nil s) #\A))
+  (assert (eql (read-byte s nil s) 66))
+  (assert (eql (read-byte s nil s) #xe0))
+  (assert (eql (read-char s nil s) #\C)))
+
+(delete-file "bivalent-stream-test.txt")
+
+(sb-ext:quit :unix-status 104)