- TypeVar/ParamSpec repr: use infer_variance flag
- ParamSpec: add type_check on bound argument
- ParamSpecArgs/Kwargs: use equality instead of identity
- NoDefault: change to IMMUTABLETYPE flag
- subscript_generic: wrap TypeVarTuple in Unpack
- symboltable: selective name mangling in type param scopes
- symboltable: fix double default scanning for non-generic fns
- Unmark 4 passing tests in test_type_params
- Replace chrono with CRT functions (wcsftime, _gmtime64_s,
_localtime64_s, _mktime64) on Windows for correct behavior
- Fix timezone name corruption: use take_while instead of filter
for null-terminated wide strings in TIME_ZONE_INFORMATION
- Fix wcsftime symbol name (_wcsftime -> wcsftime)
- Fix CString import cfg to unix-only
- Remove 13 expectedFailure markers from test_time for Windows
- Add bytearray.resize() method
- BytesIO: support keyword arg for initial_bytes
- BytesIO.seek: clamp negative positions to 0
- BytesIO.close: raise BufferError on active exports
- BytesIO.getbuffer: check closed state
- Set UnsupportedOperation.__module__ to "io"
- Rewrite compile_dict to preserve insertion order with ** unpacking
- Fix function call error messages to include function name and
keyword-only argument counts
- Fix missing keyword-only argument error to list all missing args
- Fix starred expression error messages to match CPython
- Fix "cannot unpack non-iterable" error message
- Remove resolved expected failure markers in test_extcall and
test_unpack_ex
Annotation scope:
- Remove module-level annotation re-scan that created phantom
sub_tables, breaking annotation closure for comprehensions
- Add async comprehension check in symbol table with
is_in_async_context(); annotation/type-params scopes are
always non-async
- Save/restore CompileContext in enter/exit_annotation_scope
to reset in_async_scope
Deadlock prevention:
- Fix TypeVar/ParamSpec/TypeVarTuple __default__ and
evaluate_default by cloning lock contents before acquiring
a second lock or calling Python
Other fixes:
- Add HEAPTYPE flag to Generic for correct pickle behavior
- Guard heaptype_ext access in name_inner/set___name__/
set___qualname__ with safe checks instead of unwrap
- Fix MRO error message to include base class names
- Add "format" to varnames in TypeAlias annotation scopes
- Fix single-element tuple repr to include trailing comma
Annotation scopes now inherit can_see_class_scope from parent scopes
(not just direct Class parents), allowing annotations in generic
methods inside classes to access class variables via __classdict__.
Remove 3 expectedFailure markers from test_type_params.
- Reject nonlocal binding for type parameters in symboltable
- Enable __class_getitem__ on memoryview, Template, Interpolation
- Fix __set_name__ error note to quote attribute name
- Set re.Match and re.Pattern module to "re" instead of "_sre"
- Migrate parking_lot::Mutex to PyMutex in typevar.rs
- Collapse nested if-let chains in typing_type_repr (clippy)
- Remove 5 expectedFailure markers from test files
- Implement _ConstEvaluator type in _typing module with STRING
format support via typing_type_repr (port of _Py_typing_type_repr)
- Add evaluate_bound, evaluate_constraints, evaluate_default
pygetset properties to TypeVar, ParamSpec, TypeVarTuple
- Emit format validation in evaluator scopes
(compile_type_param_bound_or_default, TypeAlias value scopes)
so evaluators raise NotImplementedError for unsupported formats
- Add non-default-after-default SyntaxError in scan_type_params
- Fix ParamSpec default_value to use Mutex for proper caching
- Fix TypeVar constructor: evaluate_constraints set to None
instead of constraints tuple for eager-constructed TypeVars
- Pass format=1 (FORMAT_VALUE) to all lazy evaluator calls
- Remove 6 expectedFailure markers from test_type_params
- Replace chrono-based gmtime/localtime/mktime/strftime/asctime/ctime
with direct libc calls (gmtime_r, localtime_r, mktime, strftime)
on unix, keeping chrono as fallback for non-unix platforms
- Add checked_tm_from_struct_time for struct_time field validation
- Accept None in gmtime/localtime/ctime (OptionalArg<Option<>>)
- Fix StructTimeData field order: tm_zone before tm_gmtoff
- Fix PyStructTime slot_new to accept optional dict argument
- Add interactive REPL mode: auto-print expression results in single mode
- Implement Destructor for PyGenerator and PyCoroutine
- Add locals_dirty tracking and locals_to_fast() for frame sync
- Add per-line tracing with prev_line tracking in execution loop
- Fix gen_throw to close sub-iterator on GeneratorExit (gen_close_iter)
- Pass callable object as arg in c_call/c_return/c_exception trace events
- Distinguish [Errno] vs [WinError] for CRT vs Win32 API errors
- Fix tee thread safety with AtomicBool running flag
- Fix division error messages to match expected format
* Replace `once_cell` with `std::sync::OnceLock`/`core::cell::OnceCell`
- Replace `once_cell::sync::{Lazy, OnceCell}` with
`std::sync::{LazyLock, OnceLock}`
- Replace `once_cell::unsync::{Lazy, OnceCell}` with
`core::cell::{LazyCell, OnceCell}`
- Inline `get_or_try_init` at call sites (unstable in std as of 1.93)
- Replace `OnceCell::with_value()` with `OnceCell::from()` in codecs.rs
- Remove `once_cell` direct dependency from common and vm crates
* Auto-format: cargo fmt --all
---------
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Wait for module initialization to complete when a module is
already in sys.modules but still being initialized by another
thread. Check __spec__._initializing and call
_lock_unlock_module to block until the import finishes.
Add `source_path: AtomicPtr<PyStrInterned>` field to `PyCode`
for interior mutability, replacing the UB-inducing
`#[allow(invalid_reference_casting)]` + `write_volatile` pattern
in `update_code_filenames`. Use atomic load/store instead of a
mutex since the operation is a simple pointer swap on a 'static
reference. Update all read sites to use `source_path()` accessor.
For example in the following code:
def foo(x: int, y: float):
def bar(q: int):
return q
pass
Make sure that `foo` type annotations are correctly propogated to
it's `__annotate__` and `__annotations__` attributes.
With this chage, we'll get:
>>>>> foo.__annotations__
{'x': <class 'int'>, 'y': <class 'float'>}
Previously annotations where 'lost', and we would get:
>>>>> foo.__annotations__
{}
- Replace static_cell! cached builtins_iter/builtins_reversed with
per-call vm.builtins.get_attr lookups to support runtime builtins
mutation (CPython issue #101765)
- Refactor PositionIterInternal::reduce to take func, active, and
empty callbacks; resolve builtins outside the lock to prevent
deadlock from reentrant iterator access
- Add __reduce__ and fix reentrant next() in PyCallableIterator
- Remove expectedFailure from test_reverse_iterator_picking and
test_reduce_mutating_builtins_iter
* temp regrtest save_env patch
* Refactor signal_handlers from Option to OnceCell
- Change `signal_handlers` type from `Option<Box<...>>` to
`OnceCell<Box<...>>` so fork children can lazily initialize it
- Add `VirtualMachine::is_main_thread()` using runtime thread ID
comparison instead of structural `signal_handlers.is_none()` check
- Initialize signal handlers in `py_os_after_fork_child()` via
`get_or_init()` for workers that fork
- Use `get_or_init()` in `signal()` and `getsignal()` functions
- Remove `set_wakeup_fd(-1)` special-case workaround (d6d0303)
- Extract `signal::new_signal_handlers()` to deduplicate init expr
- Allow `getsignal()` from any thread (matches CPython behavior)
- Fix `set_wakeup_fd` error message to name the correct function
* `std` feature for common
- Gate OS-dependent modules behind `#[cfg(feature = "std")]`
- Replace `std::f64` with `core::f64` in float_ops
- Replace `std::process::abort` with panic in refcount
- Remove `thread_local` from levenshtein (stack buffer)
- Split static_cell into threading/non_threading/no_std
* `std` for codegen
* `no_std` for pylib
Add `source_path: PyMutex<&'static PyStrInterned>` field to
`PyCode` for interior mutability, replacing the UB-inducing
`#[allow(invalid_reference_casting)]` + `write_volatile` pattern
in `update_code_filenames`. Update all read sites across the
codebase to use the new `source_path()` accessor method.
* Fix test_import: import machinery and errors
- Emit IMPORT_FROM instead of LOAD_ATTR for `import a.b.c as m`
- Add "partially initialized module" error for circular imports
- Add "cannot access submodule" error for initializing submodules
- Implement script shadowing detection with "consider renaming" hint
- Detect user scripts shadowing stdlib/third-party modules
- Compute original sys.path[0] from sys.argv[0]
- Check sys.stdlib_module_names for stdlib detection
- Respect safe_path setting
- Implement _imp._fix_co_filename for code source_path rewriting
- Add data parameter to _imp.get_frozen_object with marshal deser
- Fix import_from: check __spec__.has_location before using origin
- Set ImportError.path attribute on import failures
- Fix import_star error messages for non-str __all__/__dict__ items
- Always call builtins.__import__ in import_inner
* Propagate __bool__ errors from fromlist in import
Previously, try_to_bool errors were silently swallowed via .ok(),
causing fromlist with broken __bool__ to default to false.
* Add host_env feature for sandbox isolation
Introduce a `host_env` feature flag that gates all host environment
access (filesystem, network, signals, processes). When disabled,
the VM operates in sandbox mode:
- _io module always available; FileIO gated by host_env
- SandboxStdio provides lightweight stdin/stdout/stderr via Rust std::io
- BytesIO/StringIO/BufferedIO/TextIOWrapper work without host_env
- open() returns UnsupportedOperation in sandbox
- stdlib modules (os, socket, signal, etc.) gated by host_env
- CI checks both host_env ON and OFF builds
* Auto-format: ruff check --select I --fix
---------
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
* Generate optimized oparg enums
* No need to match on 255
* Remove `num_enum` crate from `compiler-core`
* Update `Cargo.lock`
* macro fmt
* Rename macro vars
* Match without `,`
* Support alternative values
* Fix alternatives
* Improve docs
* Add const assert
* Don't use `as u32`
* Make only ComparisonOperator unoptimized
* Fix test
* cleanup
* All opargs are optimized
* Remove comment
* Update codeop from v3.14.3
* Fix traceback, syntax errors, and exception handling
- Improve unclosed bracket detection with "'(' was never closed" message
- Fix IndentationError location to point to end of line
- Implement frame.clear() with proper checks for executing/suspended frames
- Fix exception context chaining for propagated exceptions
- Add traceback.__dir__() and prevent tb_next deletion
- Fix subscript operation source range restoration in compiler
- Change "duplicate parameter" to "duplicate argument" error message
- Refactor duplicate code in asyncgenerator.rs and frame.rs
---------
Co-authored-by: CPython Developers <>
Assisted-by: Codex:gpt-6
- Add already_warned() with filter version tracking
- Add type validation for _defaultaction and _onceregistry
- Use direct function names for _warnings pyattr/pyfunction
- Route stdlib::warnings::warn through warn::warn
- Remove spurious EncodingWarning from TextIOWrapper
- Clean up comments and simplify check_matched error handling
- Remove expectedFailure from 3 passing test_warnings tests
- Extract singleton_node_to_object() helper for operator/context nodes
- Rename PY_COMPILE_FLAG_AST_ONLY to PY_CF_ONLY_AST
- Rename populate_match_args_and_attributes to populate_repr
- Set _attributes in impl_base_node! no-args variant
- Simplify ast_reduce with .is_some() instead of drop(value)
- Remove _ prefix from used parameters across ast/ files
- Fix slot_new comment to explain why slot_init is called
Lee Dogeon