Originally there was only one struct that didn't have an offset member.  I
submitted a patch that added offset and made various code changes to ensure
its use so warnings/error messages could correctly calculate the line
number.

Although I didn't like that "offset" was left out of the public-facing API,
there was a legitimate need: it would've forced a backward incompatibility
when shared libraries or windows DLLs using the old API were used.

To account for this it was proposed that a 2nd "internal" type be made that
has offset, while the public API version of the type remained the same.

-brian
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