well, it’d be re-exec’ing against e.g.

sys.argv[0]

which is

'/Users/kwilson/dev/pants/src/python/pants/bin/pants_exe.py'

for srcmode and

'/Users/kwilson/.cache/pants/pex/bin/pants.pex/1.3.0.dev15-tw3/pants.pex'

for pex mode.