[issue35370] Add _PyEval_SetTrace(tstate, func, arg) function

[Fabio Zadrozny]

Fabio Zadrozny <fabioz at users.sourceforge.net> added the comment:

Holding the GIL is a reasonable constraint.

As a note, the original request was for a Python-level tracing function (so that in the future other Python implementations also provide that function) -- does this need a PEP?

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