Files
RustPython/Lib
Jeong, YunWon 8c016157f4 marshal (#7467)
* CPython-compatible marshal format

Unify marshal to a single CPython-compatible format. No separate
"cpython_marshal" reader — one format for frozen modules, .pyc
files, and the Python-level marshal module.

- ComparisonOperator: `(cmp_index << 5) | mask` matching COMPARE_OP
- MakeFunctionFlag: bit-position matching SET_FUNCTION_ATTRIBUTE
- Exception table varint: big-endian (matching Python/assemble.c)
- Linetable varint: little-endian (unchanged)
- Integer: TYPE_INT (i32) / TYPE_LONG (base-2^15 digits)
- Code objects: CPython field order (argcount, posonlyargcount, ...,
  co_localsplusnames, co_localspluskinds, ..., co_exceptiontable)

- FLAG_REF / TYPE_REF for object deduplication (version >= 3)
- allow_code keyword argument on dumps/loads/dump/load
- Subclass rejection (int/float/complex/tuple/list/dict/set/frozenset)
- Slice serialization (version >= 5)
- Buffer protocol fallback for memoryview/array
- Recursion depth limit (2000) for both reads and writes
- Streaming load (reads one object, seeks file position)
- TYPE_INT64, TYPE_FLOAT (text), TYPE_COMPLEX (text) for compat

serialize_code writes co_localsplusnames/co_localspluskinds from
split varnames/cellvars/freevars. deserialize_code splits them back.
Cell variable DEREF indices are translated between flat (wire) and
cell-relative (internal) representations in both directions.

Replace bitwise trick with match for new ComparisonOperator values.

21 -> 3 expected failures. Remaining: test_bad_reader (IO layer),
test_deterministic_sets (PYTHONHASHSEED), testIntern (string interning).

* Address code review: preserve CO_FAST_HIDDEN, fix varint overflow

- Use original localspluskinds from marshal data instead of
  rebuilding, preserving CO_FAST_HIDDEN and other flags
- Fix write_varint_be to handle values >= 2^30 (add 6th chunk)
- Remove unused build_localspluskinds_from_split

* Add depth guard to deserialize_value_typed

Prevents usize underflow when dict key deserialization path calls
deserialize_value_typed with depth=0 on composite types.
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Standard Library for RustPython

This directory contains all of the Python files that make up the standard library for RustPython.

Most of these files are copied over from the CPython repository (the 3.7 branch), with slight modifications to allow them to work under RustPython. The current goal is to complete the standard library with as few modifications as possible. Current modifications are just temporary workarounds for bugs/missing feature within the RustPython implementation.

The first big module we are targeting is unittest, so we can leverage the CPython test suite.