Newbie ask: where can I find boost_1_71_0/libs/python/src/exec.cpp on current repo?

Dear all commiters, we are using boost1.71.0 and found an uncloced file exception on boost_1_71_0/libs/python/src/exec.cpp.

But I failed to find this file on cueernt repo.

Is this file removed on the current version?

Thanks.