A SegmentationError raised by the plan grammar escaped main() as a
traceback and exit 1, while every other malformed-plan case in the same
file already returned 2. Exit codes are the interface a caller scripts
against, and exit 1 with a traceback is the code an unhandled bug
produces -- it says "this command broke" where the truth is "this file
is not a plan".
The refusal itself is unchanged: nothing was written before and nothing
is written now, and the grammar in src/ is untouched. What changes is
one line on stderr naming the error code, and the exit code.
Both branches that can raise are covered: the pre-write parse of a
non-empty plan, and the required-field check reached through the empty
branch.
The old behaviour was pinned by
test_an_entries_value_that_is_not_a_list_is_still_refused, which
asserted that a wrongly-typed `entries` reaches the caller as a raised
SegmentationError and recorded that as a finding rather than fixing it.
That test is rewritten here, in the same commit as the code, to assert
exit 2 plus the code on stderr. A second test pins the one-line stderr
shape on the non-empty branch.
Suite 1072 -> 1073 passed; ruff and mypy --strict clean.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Kjell Tore Guttormsen
a72053f66f