v2.4.1 — Terra Generica

Bug fixes

• Crash on PEP 695 generic syntax — class C[T], def f[T], and
  type A[T] = ... (Python 3.12+) caused a KeyError in
  visit_FunctionDef because CPython's symtable inserts an implicit
  type-parameter scope that doubled the namespace path. The fix
  preserves the type-parameter scope as a proper lexical closure
  (essentially a let-over-lambda), matching Python's actual scoping
  semantics. Handles all PEP 695 forms: generic classes, generic
  functions, generic methods, nested generics, multiple/bounded type
  parameters, and type parameter shadowing in class bodies.
  (#123 — thanks @uselessscat)

Internal

• Visitor scope management via context managers — visit_Module,
  visit_ClassDef, visit_FunctionDef, and visit_TypeAlias now use
  contextlib.contextmanager-based helpers (_module_scope,
  _class_scope, _function_scope, _type_params_scope) instead of
  manual push/pop pairs, guaranteeing cleanup on exception.