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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"in debug mode, compile(ast) fails with an assertion error if an AST node has no line number information","articleBody":"BPO | [21385](https://bugs.python.org/issue21385)\n--- | :---\nNosy | @terryjreedy, @vstinner, @benjaminp, @bitdancer, @PCManticore, @ztane\nSuperseder | \u003cli\u003ebpo-26107: PEP 511: code.co_lnotab: use signed line number delta to support moving instructions in an optimizer\u003c/li\u003e\nFiles | \u003cli\u003e[astlinenotest.py](https://bugs.python.org/file35090/astlinenotest.py \"Uploaded as text/plain at 2014-04-29.09:00:09 by @ztane\"): an example of how to trigger the assertion failure using ASTs and compile\u003c/li\u003e\n\n\u003csup\u003e*Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.*\u003c/sup\u003e\n\n\u003cdetails\u003e\u003csummary\u003eShow more details\u003c/summary\u003e\u003cp\u003e\n\nGitHub fields:\n```python\nassignee = None\nclosed_at = \u003cDate 2016-01-20.11:35:39.832\u003e\ncreated_at = \u003cDate 2014-04-29.09:00:10.830\u003e\nlabels = ['interpreter-core', 'type-crash']\ntitle = 'in debug mode, compile(ast) fails with an assertion error if an AST node has no line number information'\nupdated_at = \u003cDate 2016-01-20.11:35:39.830\u003e\nuser = 'https://github.com/ztane'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2016-01-20.11:35:39.830\u003e\nactor = 'vstinner'\nassignee = 'none'\nclosed = True\nclosed_date = \u003cDate 2016-01-20.11:35:39.832\u003e\ncloser = 'vstinner'\ncomponents = ['Interpreter Core']\ncreation = \u003cDate 2014-04-29.09:00:10.830\u003e\ncreator = 'ztane'\ndependencies = []\nfiles = ['35090']\nhgrepos = []\nissue_num = 21385\nkeywords = []\nmessage_count = 7.0\nmessages = ['217502', '217806', '218383', '218412', '218700', '218723', '258670']\nnosy_count = 6.0\nnosy_names = ['terry.reedy', 'vstinner', 'benjamin.peterson', 'r.david.murray', 'Claudiu.Popa', 'ztane']\npr_nums = []\npriority = 'normal'\nresolution = 'fixed'\nstage = 'needs patch'\nstatus = 'closed'\nsuperseder = '26107'\ntype = 'crash'\nurl = 'https://bugs.python.org/issue21385'\nversions = ['Python 2.7', 'Python 3.4', 'Python 3.5']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/ztane","@type":"Person","name":"ztane"},"datePublished":"2014-04-29T09:00:11.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/65584/cpython/issues/65584"}