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make-synonym-stream  symbol ⇒  synonym-stream
symbol—a symbol that names a dynamic variable.
synonym-stream—a synonym stream.
Returns a synonym stream whose synonym stream symbol is symbol.
 (setq a-stream (make-string-input-stream "a-stream")
        b-stream (make-string-input-stream "b-stream"))
⇒  #<String Input Stream> 
 (setq s-stream (make-synonym-stream 'c-stream))
⇒  #<SYNONYM-STREAM for C-STREAM> 
 (setq c-stream a-stream)
⇒  #<String Input Stream> 
 (read s-stream) ⇒  A-STREAM
 (setq c-stream b-stream)
⇒  #<String Input Stream> 
 (read s-stream) ⇒  B-STREAM
Should signal type-error if its argument is not a symbol.