Preserve main 8d27253 and existing migration work without rewriting history. The resulting source tree exactly matches previously tested PR merge de5bb1b979. No Lib files change in this merge.
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Use the existing f-string body unparser for template interpolation format specs, while preserving the outer interpolation source text. Add compile-only Python annotation-constant coverage.
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Restrict mappingproxy ordering, use final codec registry normalization, and prefer index conversion before float conversion for sleep. Retain universal Python assertions and import the matching final codec/time canonical test hunks plus the non-ASCII codec-name deprecation warning.
Upstream source: CPython d220409a13b77de7a6c30abe16ea90db01528edc. The existing codec normalization implementation and bytecode contract remain unchanged.
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Preserve newly merged Python 3.14 compatibility work before applying the three required final-3.15 contract adjustments exposed by merge CI.
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Match Python 3.14 by excluding coroutine-marked generator expressions from builtin call optimization. Reuse the existing cursor-preserving comprehension lookup so nested outer iterable scopes do not select the wrong symbol table; propagate lookup errors.
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Match the Python 3.14 wrapper type flag and enable the existing guarded method-call fast path. Keep the partial vectorcall changes separate.
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Only lazy aliases may obtain their module from the evaluation function. Eager aliases without a caller __name__ must not inspect their stored value.
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Keep the existing conversion and initialization path while binding format as positional-or-keyword, matching Python 3.14.
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Preserve CPython signed nanosecond conversion precedence for reentrant and nonblocking acquisition, without changing the platform timeout maximum.
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Preserve the wrapper-pickle regressions merged into main while refreshing the independent length checks.
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* Track live entries in reverse dictionary iterators
Extract the Python 3.14-compatible remaining-count and same-size storage handling from #8954. Preserve the older deferred exhaustion and extra-yield contract, using explicit wrapping arithmetic rather than the Python 3.15 extra-yield error and cursor clamp. Cover deleted-slot hints and mutation after the last yield in the existing Python snippet.
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* Enable the repaired reverse-dict restoration regression
The patched native interpreter unexpectedly passes the existing reverse-dict clear/restore test. Remove only its obsolete expected-failure decorator, preserving the canonical assertions and all other markers.
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* Preserve reverse iterator invalidation on atomic relocation
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Follow up on #9055: RustPython targets abi3t, which does not require this legacy binary-compatibility entry point.
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Extract the Python 3.14-compatible descriptor slot dispatch from #8954. Call the raw type attribute with descriptor, instance and owner, preserving ownership and recursion handling. Extend the existing Python snippet for staticmethod, classmethod, callable-object and ordinary __get__ replacements.
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* Preserve reflected addition for native sequence subclasses
Extract the Python 3.14-compatible sequence-add slot distinction from #8954 without its unconditional numeric-slot clearing. Preserve stateful duplicate-slot behavior, exact descriptor identity, inherited reflected priority and a stable wrapper function address. Extend the existing addition snippet only for the uncovered inherited-native and slot-update cases.
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* Use stored MRO for sequence descriptor ownership
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Extract the Python 3.14-compatible signed timestamp conversion from #8954, preserving floor rounding, float-or-index argument rules and signed divmod remainders. Reuse the existing Windows file-time helper rather than the mega patch range restriction, and keep the 3.14 argument diagnostics. Add three concise parser regressions to the existing os snippet without native filesystem range assumptions.
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Extract the Python 3.14-compatible timeout validation order from #8954. Share validation with Lock and run it before increasing the RLock recursion count. Keep canonical general-lock coverage and add only owned-lock validation regressions to the existing thread snippet.
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* Use current locale for byte regular-expression matching
Extract the Python 3.14-compatible LOCALE matching paths from #8954, keeping host callbacks outside the no_std engine and preserving the C-locale fallback. Existing canonical regex tests cover locale changes and compiled patterns. Keep expected-failure markers until patched native execution proves they are obsolete; omit duplicate snippet tests and Python 3.15 prefixmatch additions.
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* Enable the repaired locale caching regression
The exact patched native interpreter passes the existing locale flag and compiled-pattern tests and unexpectedly passes locale caching. Remove only the obsolete expected-failure decorator; preserve all canonical assertions and platform skips.
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Extract the Python 3.14-compatible lookup diagnostic fix from #8954 while retaining the existing registry normalization. Cover original error spelling and normalized search-hook names in the existing codec snippet.
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Extract the independent Python 3.14-compatible constructor fix from #8954. An explicit name replaces __name__ while __qualname__ remains the code qualified name. Add a focused regression to the existing types snippet.
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Extract the Python 3.14-compatible annotation result check from #8954 without its Python 3.15 diagnostics. Preserve the returned dict subclass and cached identity, and cover the behavior in the existing module snippet.
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Extract the Python 3.14-compatible ordering fix from #8954. An existing Warning instance determines its own category, regardless of the category argument. Keep canonical invalid-category coverage and add only the missing instance case to the existing warnings snippet.
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Extract attrgetter, itemgetter and methodcaller GC traversal from #8954. Add four bounded reference-cycle cases to the existing operator snippet, including a non-dotted str subclass retained by attrgetter.
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Extract the Python 3.14-compatible solid-base check from #8954. Prefix member cells contribute to instance layout even though they do not change basicsize. Include member_count in shape comparison while preserving all native layout safeguards, and cover conflicting and compatible bases in the existing type snippet.
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Extract the Python 3.14 comparison contract from #8954 without its 3.15 ordering restrictions or defensive copies. Return the wrapped mapping comparison result without truth conversion. Cover all six direct and reflected operations in the existing mappingproxy snippet.
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Extract wrapper descriptor reduction from #8954 for Python 3.14. Reduce to getattr on the defining class and cover direct reduction plus one roundtrip in the existing pickle snippet. Preserve canonical expected failures for unrelated staticmethod descriptor behavior.
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Extract the Python 3.14-compatible view representation from #8954. Snapshot view elements before invoking their repr methods, preserve recursion handling, and cover each view in the existing collections snippet. Leave migration-specific mapping changes out.
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Track consumed positional arguments, including star width and precision, and preserve mapping key representations in decimal conversion diagnostics.
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FILETIME reports historical DST as unknown, so calculate the actual offset rather than selecting standard-time bias.
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Reject retired missing-field and arbitrary-keyword forms while preserving defaults and explicit placeholders. Sync only matching final CPython constructor test hunks.
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Use exact sequence-type guards and preserve generic fallback diagnostics. Validate both cold and warmed expressions without implementation-specific assertions. Reject stale CPython source checkouts and cross-version library caches.
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Preserve existing coverage while following verified final behavior for script metadata, builtin signatures and loading, AST fixture construction, memoryview diagnostics, mmap search bounds, and struct format errors. The unchanged final comparator exposes the earlier expectations; focused native baseline failures establish the required implementation changes.
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Update active version and comparison configuration to Python 3.15.0. Preserve the alpha implementation status, actual bytecode format, and existing libraries pending separate migration. Align generated library-upgrade workflow pins without changing permissions or actions.
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