old_contents: __all__ = ["tools", "loader", "clib"]
  
  from . import tools
  from . import loader
  
  import pyximport
  pyximport.install()
  from . import clib
  
new_contents: __all__ = ["tools", "loader", "clib"]
  
  from . import tools
  from . import loader
  
  import pyximport
  pyximport.install(build_in_temp=True)
  from . import clib
  
subject: set pyximport.install(build_in_temp=True), to fix