> Oh, just had another thought, ... I've a vague memory that
> all the numerical variables are saved and restored over an
> ${if item so that you can nest them in a reasonable way. I
> bet that's it... ah yes, here's the documentation paragraph
> that is part of the ${if description:
>
> At the start of an if expansion the values of the numeric variable
> substitutions $1 etc. are remembered. Obeying a match
> condition that
> succeeds causes them to be reset to the substrings of
> that condition
> and they will have these values during the expansion of
> the success
> string. At the end of the if expansion, the previous values are
> restored. After testing a combination of conditions using or, the
> subsequent values of the numeric variables are those of the
> condition that succeeded.
>
> So I don't need to do a test after all.
But in my case there was no previous value as the ${if is not nested.
Would it be possible for Exim to be changed so that at the end of an if
expansion a numerical variable is only reset if it held a value before?
Paul McIlfatrick
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