I'm trying to understand how CPython implements closure variable capture and there is one minor point I can't understand.
When a local is captured it gets allocated in co_cellvars and is accessed with (LOAD|STORE)_DEREF, and this is clear. However when a local is coming from a parameter it gets ALSO allocated in co_varnames even if the local slot apparently is not accesible because *_FAST opcodes are not generated. Is there a technical reason for this? It happens in CPython 2, 3 and even in PyPy... Andrea Griffini
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