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bpo-36936: CALL_FUNCTION_KW keyword names must be non-empty #13357

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bpo-36936: CALL_FUNCTION_KW keyword names must be non-empty #13357

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3 changes: 2 additions & 1 deletion Doc/library/dis.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -1136,7 +1136,8 @@ All of the following opcodes use their arguments.

Calls a callable object with positional (if any) and keyword arguments.
*argc* indicates the total number of positional and keyword arguments.
The top element on the stack contains a tuple of keyword argument names.
There must be at least one keyword argument. The top element on the stack
contains a non-empty tuple of keyword argument names.
Below that are keyword arguments in the order corresponding to the tuple.
Below that are positional arguments, with the right-most parameter on
top. Below the arguments is a callable object to call.
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4 changes: 3 additions & 1 deletion Python/ceval.c
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Expand Up @@ -3357,7 +3357,9 @@ _PyEval_EvalFrameDefault(PyFrameObject *f, int throwflag)
PyObject **sp, *res, *names;

names = POP();
assert(PyTuple_CheckExact(names) && PyTuple_GET_SIZE(names) <= oparg);
assert(PyTuple_CheckExact(names));
assert(PyTuple_GET_SIZE(names) > 0);
assert(PyTuple_GET_SIZE(names) <= oparg);
sp = stack_pointer;
res = call_function(tstate, &sp, oparg, names);
stack_pointer = sp;
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