Bug report

Bug description:

I should've caught this in#116626 but somehow I missed it.INSTRUMENTED_FUNCTION_CALL_EX setsarg0 toNone now, instead ofMISSING, when there's no argument.

deff(a=1,b=2):returna+bempty_args= []f(*empty_args)# arg0 will be None

CPython versions tested on:

3.12, CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-116735: UseMISSING forCALL event if argument is absent #116737
• [3.12] gh-116735: UseMISSING forCALL event if argument is absen… #116873