A file opts into the strict NAFTAG lifetime mode with a leading
from __future__ import __cwa__
and only that file changes: every other module keeps the legacy @life
escape analysis, so existing code is untouched.
- detect_strict_cwa publishes the flag per file (reset before each
translation, also visible to the .vpi pass); the directive must be the
file's first statement, a module docstring may precede it
- the directive is not a module import: import translation returns early
and the .vpi writer skips it, so importers never look for `__future__`
- strict files reject @life/@willFree with LifetimeError; the OBS
call-site contracts are the only boundary syntax there
- Translator.StrictCWA carries the mode for the current file
TermiNexus
40e3388dc3