bpo-42282: Fold constants inside named expressions - #23190
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ncoghlan merged 5 commits intoNov 7, 2020
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* The AST optimiser wasn't descending into named expressions, so any constant subexpressions weren't being folded at compile time * Remove "default:" clauses inside the AST optimiser code to reduce the risk of similar bugs passing unnoticed in future compiler changes
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@brandtbucher I noticed this omission while working on PEP 642. |
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methane
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LGTM
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The CI failures were due to one of the switch statements using an int rather than an AST enum type, so the compiler didn't know there were unhandled cases after I dropped the default: clause. I switched it to using cmpop_ty and added the missing cases. |
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There was a second set of CI failures due to a regression in binary operator folding (it wasn't clearing divide-by-zero errors), but the failure after that was just a GitHub Actions glitch (I have the tests passing locally now - I hadn't checked that before the first push). |
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shihai1991
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…lots1 * origin/master: (80 commits) bpo-42282: Fold constants inside named expressions (pythonGH-23190) bpo-41028: Doc: Move switchers to docsbuild-scripts. (pythonGH-20969) bpo-42133: update parts of the stdlib to fall back to `__spec__.loader` when `__loader__` is missing (python#22929) Remove outdated reference to pywin32 from platform module (pythonGH-22005) bpo-41832: PyType_FromModuleAndSpec() now accepts NULL tp_doc (pythonGH-23123) Minor grammar edits for the descriptor howto guide (GH-python#23175) bpo-42179: Doc/tutorial: Remove mention of __cause__ (pythonGH-23162) bpo-26389: Allow passing an exception object in the traceback module (pythonGH-22610) bpo-42260: PyConfig_Read() only parses argv once (pythonGH-23168) bpo-42260: Add _PyConfig_FromDict() (pythonGH-23167) bpo-41877 Check for asert, aseert, assrt in mocks (pythonGH-23165) [docs] fix wrongly named AsyncContextDecorator (pythonGH-23164) bpo-42262: Add Py_NewRef() and Py_XNewRef() (pythonGH-23152) bpo-42266: Handle monkey-patching descriptors in LOAD_ATTR cache (pythonGH-23157) bpo-40816 Add AsyncContextDecorator class (pythonGH-20516) bpo-42260: Add _PyInterpreterState_SetConfig() (pythonGH-23158) Disable peg generator tests when building with PGO (pythonGH-23141) bpo-1635741: _sqlite3 uses PyModule_AddObjectRef() (pythonGH-23148) bpo-1635741: Fix PyInit_pyexpat() error handling (pythonGH-22489) bpo-42260: Main init modify sys.flags in-place (pythonGH-23150) ...
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* The AST optimiser wasn't descending into named expressions, so any constant subexpressions weren't being folded at compile time * Remove "default:" clauses inside the AST optimiser code to reduce the risk of similar bugs passing unnoticed in future compiler changes
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any constant subexpressions weren't being folded at compile time
risk of similar bugs passing unnoticed in future compiler changes
https://bugs.python.org/issue42282