Add Instruction::BuildListFromArg = 219 (stack effect: pop 1, push 2): pop
the iterator, push an empty list whose capacity is the iterator's length
hint, push the iterator back. A failing length hint is ignored unless it is
SystemExit or KeyboardInterrupt.
With CompileOpts::build_list_from_arg set, a list comprehension with one
generator, no `if` and no `async for` emits it in place of BUILD_LIST 0 on
the non-inlined path and in place of BUILD_LIST 0; SWAP 2 on the inlined
path. The option defaults to false, so default output is unchanged.
Assisted-by: Claude
* Align compiler and VM with final CPython 3.15 bytecode
Reconstruct the compiler-only baseline from validated487ae47 on the current main and frozen mapping prerequisitec78d811. Preserve the full source delta while dropping obsolete prerequisite ancestry; detailed old-to-new provenance is retained in the recovery artifact.
Assisted-by: OpenAI Codex: model identifier unavailable
* Fix final script validation, exception cleanup and private cache contracts
Replay reviewed compiler CI repairs 2191a9d, 1f1fe04, a2dacaf on the frozen current prerequisite. Intermediate compile/diagnostic corrections are combined where they address the same failure.
Assisted-by: OpenAI Codex: model identifier unavailable
* Align canonical compiler fixtures and generator frame state
Replay reviewed compiler CI repairs 476bb74 on the frozen current prerequisite. Intermediate compile/diagnostic corrections are combined where they address the same failure.
Assisted-by: OpenAI Codex: model identifier unavailable
* Preserve code-name owners and final warning and constant-fold contracts
Replay reviewed compiler CI repairs 6482adf on the frozen current prerequisite. Intermediate compile/diagnostic corrections are combined where they address the same failure.
Assisted-by: OpenAI Codex: model identifier unavailable
* Skip unavailable monitoring C API tests before tool registration
Replay reviewed compiler CI repairs 246c309 on the frozen current prerequisite. Intermediate compile/diagnostic corrections are combined where they address the same failure.
Assisted-by: OpenAI Codex: model identifier unavailable
* Assert exact final constant-list iterable folding
Replay reviewed compiler CI repairs 7ecedcf on the frozen current prerequisite. Intermediate compile/diagnostic corrections are combined where they address the same failure.
Assisted-by: OpenAI Codex: model identifier unavailable
* Align local monitoring events and exception lifecycle state with final 3.15
Replay reviewed compiler CI repairs ec206b1, 191fe58 on the frozen current prerequisite. Intermediate compile/diagnostic corrections are combined where they address the same failure.
Assisted-by: OpenAI Codex: model identifier unavailable
* Align 3.15 code objects and codegen with CPython
- Store co_consts, co_names, co_localsplusnames, co_localspluskinds,
co_linetable, co_exceptiontable and co_name as objects on PyCode;
build co_code and the varnames/cellvars/freevars tuples lazily in
_co_cached, with co_code deoptimized through deopt_code.
- Move the compiler constant cache (_PyCode_ConstantKey,
const_cache_insert) to builtins/code/const_cache.rs.
- Write every code field with w_object in marshal and pass the read
field objects to MarshalBag::make_code through CodeFields.
- Emit RETURN_GENERATOR/POP_TOP in enter_scope and place SETUP_CLEANUP
after them; drop the generator part of insert_prefix_instructions.
- Add PyCode::first_traceable (_co_firsttraceable) for
_PyFrame_IsIncomplete and sys.monitoring.
- Follow the CPython DISABLE branches in sys.monitoring, the
check_matched signature in warnings, the 3.15 % format error
messages for str and bytes, code_returns_only_none, and the FOR_ITER
stack analysis.
- Compute IMPORT_NAME flags with in_exception_handler.
- Replace the linetable/exceptiontable byte tests in codegen with
dis(show_positions=True) insta snapshots in _opcode.
- Remove the opcode metadata verification tooling, byte-exact
scripts, private cache tests and redundant snippets.
- Restore test_code.py and test_monitoring.py to v3.15.0 plus
RUSTPYTHON markers.
Assisted-by: Claude Code:claude-opus-5-5
* Remove generator snippet checks covered by Lib/test
Drop extra_tests/snippets/generator_iterator_prefix.py. Its loop,
delegation, async, f_back and never-awaited checks are covered by
test_generators, test_coroutines, test_asyncgen, test_yield_from and
test_monitoring. Move the remaining checks into existing files:
genexpr prefix tracing and monitoring into stdlib_sys.py, and the
caller frame seen from the eager iterator into stdlib_sys_getframe.py.
Assisted-by: Claude Code:claude-opus-5-5
* Emit the generator prefix for top-level await modules
Module code compiled with PyCF_ALLOW_TOP_LEVEL_AWAIT and marked
ste_coroutine now starts with RETURN_GENERATOR; POP_TOP. The prefix and
RESUME emission move into emit_scope_prefix, shared by enter_scope and
the module entry points, as in codegen_enter_scope. Fixes
test_builtin.test_compile_top_level_await.
Assisted-by: Claude Code:claude-opus-5-5
* Allow the c_long cast in _opcode.stack_effect
c_long is i32 on Windows, where clippy reports the cast to i32 as
unnecessary.
Assisted-by: Claude Code:claude-opus-5-5
* Update malachite crates to 0.14.0
pymath requires malachite-bigint ^0, so the example projects, which
have no lock file, resolve it to 0.14.0 while the workspace pinned
0.13.0, and fail to build.
Assisted-by: Claude Code:claude-opus-5-5
---------
Co-authored-by: dot <dot@youknowone.org>
New Features
Direct small-integer loading (0–255) and locals-loading for faster execution
Async-generator wrapping and improved generator resume behavior
Performance
Faster integer loads and streamlined jump/loop handling for better runtime performance
Bug Fixes
More robust StopIteration handling and stricter init return checks
Corrected iterator cleanup for async and sync loops
Improvements
Aligns loop and jump semantics with CPython 3.14 patterns
* implementing call the correct way
stack is [Option<PyObjectRef>]
* fix again
* list custom instructions
* Auto-format: cargo fmt --all
---------
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Jeong, YunWon