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NAME
    ParseIX -- initialize an input expression given a description string.
               (V36)

SYNOPSIS
    failureCode = ParseIX(description,ix);
                          A0          A1

    LONG ParseIX(STRPTR,IX *);

FUNCTION
    Given an input description string and an allocated input
    expression, sets the fields of the input expression to
    correspond to the description string.

INPUTS
    description - the string to parse
    ix - the input expression to hold the result of the parse

RESULTS
    failureCode -  0 if all went well,
                  -1 if tokens after end (code spec)
                  -2 if 'description' was NULL