fix: prevent panic when no interpreters match abi3 minimum version#3108
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messense merged 1 commit intoMar 30, 2026
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When the default Python interpreter (first on PATH) doesn't meet the abi3 minimum version and no interpreter is explicitly specified, maturin panicked with `assertion failed: !wheels.is_empty()`. This happened because `find_specified_interpreters` didn't filter by `requires-python`, so an incompatible interpreter (e.g. CPython 3.9) was selected. Then in `build_abi3_wheels`, it was excluded from both `abi3_interps` (version too low) and `non_abi3_interps` (has stable API), resulting in an empty wheels vector. Fix both layers: - Filter default interpreters by `requires-python` in `find_specified_interpreters`, so the abi3 sysconfig fallback can find compatible interpreters instead. - Replace the `assert!` in `build_abi3_wheels` and `build()` with proper error messages as defense in depth.
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When the default Python interpreter (first on PATH) doesn't meet the abi3 minimum version and no interpreter is explicitly specified, maturin panicked with
assertion failed: !wheels.is_empty().This happened because
find_specified_interpretersdidn't filter byrequires-python, so an incompatible interpreter (e.g. CPython 3.9) was selected. Then inbuild_abi3_wheels, it was excluded from bothabi3_interps(version too low) andnon_abi3_interps(has stable API), resulting in an empty wheels vector.Fix both layers:
requires-pythoninfind_specified_interpreters, so the abi3 sysconfig fallback can find compatible interpreters instead.assert!inbuild_abi3_wheelsandbuild()with proper error messages as defense in depth.Closes #3107