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mypyc emits unsafe native layout for subclass of unresolved external base

Status: Open.

#1200 In mypyc/mypyc;

· BobTheBuidler opened on Jun 2, 2026

CPyFunction async method wrappers are missing __qualname__

Status: Open.

#1199 In mypyc/mypyc;

· BobTheBuidler opened on May 31, 2026

mypyc segfaults importing compiled package with module-level __getattr__

Status: Open.

#1198 In mypyc/mypyc;

· BobTheBuidler opened on May 28, 2026

mypyc emits bare NotRequired in TypedDict runtime annotations

Status: Open.

#1197 In mypyc/mypyc;

· BobTheBuidler opened on May 27, 2026

Free-threaded CPython 3.14: container locking gaps and mypyc typed-list operation path mismatch

Status: Open.

#1196 In mypyc/mypyc;

· Synaptic724 opened on May 21, 2026

Inconsistent behaviour between mypy and mypyc with operator dunder methods

Status: Open.

#1195 In mypyc/mypyc;

· SamWilsn opened on May 20, 2026

Dunder methods that return NotImplemented explode the stack

Status: Open.

#1194 In mypyc/mypyc;

· SamWilsn opened on May 20, 2026

Subclass of AbstractContextManager without __enter__ override fails to transpile

Status: Open.

#1193 In mypyc/mypyc;

· SamWilsn opened on May 19, 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