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Fix the stale backend not-implemented message #281

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Merged
seanwevans merged 1 commit into from
Jul 21, 2026
Merged

Fix the stale backend not-implemented message #281

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5 changes: 2 additions & 3 deletions pyisolate/supervisor.py
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Original file line number Diff line number Diff line change
Expand Up @@ -57,10 +57,9 @@ def _normalize_backend(backend: str) -> BackendMode:
def _require_implemented_backend(backend: BackendMode) -> None:
if backend in IMPLEMENTED_BACKENDS:
return
implemented = ", ".join(repr(b) for b in IMPLEMENTED_BACKENDS)
raise NotImplementedError(
f"backend={backend!r} is an explicit isolation mode, but this build only "
"implements backend='subinterpreter'. Use an external process or microVM "
"launcher until the native backend is available."
f"backend={backend!r} is not implemented; this build implements {implemented}."
)


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