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gh-93143: Document LOAD_FAST_CHECK opcode #93498

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Jun 5, 2022
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gh-93143: Document LOAD_FAST_CHECK opcode #93498

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11 changes: 11 additions & 0 deletions Doc/library/dis.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -1042,6 +1042,17 @@ iterations of the loop.

Pushes a reference to the local ``co_varnames[var_num]`` onto the stack.

.. versionchanged:: 3.12
This opcode is now only used in situations where the local variable is
guaranteed to be initialized. It cannot raise :exc:`UnboundLocalError`.

.. opcode:: LOAD_FAST_CHECK (var_num)

Pushes a reference to the local ``co_varnames[var_num]`` onto the stack,
raising an :exc:`UnboundLocalError` if the local variable has not been
initialized.

.. versionadded:: 3.12

.. opcode:: STORE_FAST (var_num)

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