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Title: Bytecode parity - for-loop cleanup, return duplication, late jump threading fix by youknowone · Pull Request #7580 · RustPython/RustPython · GitHub

Open Graph Title: Bytecode parity - for-loop cleanup, return duplication, late jump threading fix by youknowone · Pull Request #7580 · RustPython/RustPython

X Title: Bytecode parity - for-loop cleanup, return duplication, late jump threading fix by youknowone · Pull Request #7580 · RustPython/RustPython

Description: Use POP_TOP instead of POP_ITER for for-loop break/return cleanup Expand duplicate_end_returns to clone final return for jump predecessors Restrict late jump threading pass to unconditional jumps only Skip exception blocks in inline/reorder passes Simplify threaded_jump_instr NoInterrupt handling Summary by CodeRabbit New Features AST objects gain a public deepcopy for reliable deep copies. Bug Fixes More robust traceback generation when location data is missing. Fixes to generator/coroutine finalization and frame cleanup. Corrected comparison behavior to honor boolean coercion where expected. Safer OS write loop handling of interruptions. Performance Improved bytecode control-flow optimizations and jump threading. Tests Added threading-related tests exercising threaded imports and exec.

Open Graph Description: Use POP_TOP instead of POP_ITER for for-loop break/return cleanup Expand duplicate_end_returns to clone final return for jump predecessors Restrict late jump threading pass to unconditional jumps o...

X Description: Use POP_TOP instead of POP_ITER for for-loop break/return cleanup Expand duplicate_end_returns to clone final return for jump predecessors Restrict late jump threading pass to unconditional jumps o...

Opengraph URL: https://github.com/RustPython/RustPython/pull/7580

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8ac7073 Bytecode parity - for-loop cleanup, return duplication, late jump thr… youknowone Apr 10, 2026 https://github.com/RustPython/RustPython/pull/7580/commits/8ac7073821af7d253a620ec7cb47d534c6a67972
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