Library /sys$common/syshlp/dbg$help.hlb DEBUG, Messages, ADDRREG  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 & not allowed on register variables: operand bound to register_name

    Facility: DEBUG, VMS Debugger

    Explanation: The C language & operator could not be applied to
    the given operand because the operand is a register variable.
    This is not allowed in the C language definition.

    User Action: Do not use the & operator on a register variable.