https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80158

--- Comment #16 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Ah, that's not it at all.  This is much more subtle.  This has to do with
candidates that have alternate interpretations (as either a CAND_ADD or a
CAND_MULT).  We fix up the candidate that we replace, but not the alternate
interpretation, if any.  In this case the alternate interpretation is used as a
basis for another chain of expressions, and we run into trouble.  Should not be
too hard to fix.

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