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mypyc leaks owned left operand for binary bytes concatenation

Status: Open.

#1192 In mypyc/mypyc;

· colinxu2020 opened on May 12, 2026

Build fails with 'cpy_r_r17' may be used uninitialized

Status: Open.

#1188 In mypyc/mypyc;

· Newbytee opened on Feb 25, 2026

mypyc should avoid emitting MSVC reserved keywords

bug

Status: Open.

#1187 In mypyc/mypyc;

· dhdaines opened on Feb 13, 2026

[bug] Segfault when mypyc-compiled class subclasses collections.defaultdict (tp_basicsize too small)

bug

crashFailing compile-time asserts, unhandled exceptions, or generated C code that's blowing up.Failing compile-time asserts, unhandled exceptions, or generated C code that's blowing up.

Status: Open.

#1186 In mypyc/mypyc;

· BobTheBuidler opened on Feb 10, 2026

[proposal] Opt‑in compile‑time folding for os.getenv/os.environ via mypycify mapping

Status: Open.

#1185 In mypyc/mypyc;

· BobTheBuidler opened on Feb 8, 2026

Exception variable used in nested function crashes mypyc

bug

crashFailing compile-time asserts, unhandled exceptions, or generated C code that's blowing up.Failing compile-time asserts, unhandled exceptions, or generated C code that's blowing up.

Status: Open.

#1184 In mypyc/mypyc;

· p-sawicki opened on Feb 6, 2026

Can't access imported Final tuples of float from compiled modules

bug

Status: Open.

#1183 In mypyc/mypyc;

· dhdaines opened on Feb 6, 2026

Multiple nested async functions with same name generate invalid C

bug

crashFailing compile-time asserts, unhandled exceptions, or generated C code that's blowing up.Failing compile-time asserts, unhandled exceptions, or generated C code that's blowing up.

Status: Open.

#1182 In mypyc/mypyc;

· p-sawicki opened on Jan 29, 2026

mypy-compiled classes omit qualname in metaclass new namespace

Status: Open.

#1181 In mypyc/mypyc;

· BobTheBuidler opened on Jan 27, 2026

Cache is rebuilt on every run

Status: Open.

#1178 In mypyc/mypyc;

· commongeek opened on Jan 9, 2026

functools.total_ordering with dataclasses.dataclass raises (starting from Python 3.14)

Status: Open.

#1176 In mypyc/mypyc;

· romintomasetti opened on Jan 4, 2026

Clearly define/document free-threading support in librt

docs

Status: Open.

#1175 In mypyc/mypyc;

· ilevkivskyi opened on Jan 2, 2026