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fix: CLIJSONDecodeError survives pickle and copy - #1494
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Sathwik-giddi wants to merge 1 commit into
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Sathwik-giddi wants to merge 1 commit into
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The default exception reconstruction protocol calls type(e)(*e.args), but e.args holds only the formatted message — one argument short of the (line, original_error) constructor — so pickle, copy, and therefore multiprocessing/ProcessPoolExecutor fail with a TypeError and take down the pool. Add __reduce__ that reconstructs from the original inputs, matching the protocol ResultError already uses. Fixes anthropics#1394
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Problem
CLIJSONDecodeErrorcannot be reconstructed bypickleorcopy, so any multiprocessing boundary it crosses (ProcessPoolExecutor) breaks withBrokenProcessPoolinstead of surfacing the error.The default exception reconstruction protocol calls
type(e)(*e.args), bute.argsholds only the formatted message — one argument short of the(line, original_error)constructor.Fix
Add a
__reduce__that reconstructs from(self.line, self.original_error), mirroring the protocolResultErroralready documents and its existing testtest_result_error_survives_pickle_and_copy. This keeps the signature intact and avoids a doubled message (Failed to decode JSON: Failed to decode JSON: ...) that makingoriginal_erroroptional alone would produce, sinceargsholds the already-formatted text.Testing
test_json_decode_error_survives_pickle_and_copyasserts pickle/copy round-trips preserveline, the original error type, and the message (with a guard against doubling).ruff check,ruff format,mypyclean; full suite passes.Fixes #1394