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HELP ASSIGN                                         Steven Hardy, March 1982

The assignment arrow, ->, tells POP-11 to store the item from the top of
the stack in the variable which follows it. The item is also removed from
the stack. If followed by a procedure call, the  assignment arrow indicates
that the *UPDATER of the procedure is to be applied.

Normally, the assignment arrow is preceded by an expression though this is
not necessary.

See also HELP
    *NDASSIGN - assignment without removing the value from the stack
    *EXPRASS  - Expressions and assignment in POP-11