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[PVS-Help] outfix operators

How can I use outfix operators?  The following theory causes 

"Error: Unrecognized expr -"

to be output in buffer *Error Output*, and gives me the choice:

SPC-scroll, I-ignore, K-keep, A-abort sends and keep or B-break:

The theory is:

test_thy: THEORY

	{||}: [int -> int] = (lambda (n: int): n+n)

	six: int = {| 3 |}
	six2: int = {| 3 |}

END test_thy

Using {||} as a prefix operator appears to work fine