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Preserve symbolic List frames in matcher residuals (adopted) - #4163
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ehildenb
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Sep 29, 2026
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Test added in #3751 falls in CI now on simplifying |
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Branch adopted from PR #4162
Fixes #4161.
Build the unmatched List residual as
remainingPrefix ++ subjectFrameinstead of inserting the List frame as an element. Add regressions for empty and nonempty remaining prefixes.Validation: both regressions fail before the fix; all 5,188 Kore tests pass. Fourmolu and HLint pass.