call site 19 for code.Source.__init__
apigen/source/testing/test_browser.py - line 62
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   def test_bases():
       tmp = py.test.ensuretemp("sourcebrowser")
       tmp.ensure("c.py").write(py.code.Source("""
       import py
       class Dir(py.test.collect.Directory):
           pass
->     """))
       mod = parse_path(tmp.join("c.py"))