code: def test_implprefix_deprecated():
      with pytest.deprecated_call():
          pm = PluginManager("blah", implprefix="blah_")
  
      class Plugin:
          def blah_myhook(self, arg1):
              return arg1
  
      with pytest.deprecated_call():
          pm.register(Plugin())
  
imports: import pytest
  from pluggy.callers import _Result
  from pluggy import PluginManager, HookimplMarker, HookspecMarker
label_desc: Use image node_id 2 for calling a global function with example usage: test_implprefix_deprecated() and returns: arg1