call site 20 for code.Source.isparseable
code/testing/test_source.py - line 86
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   def test_isparseable():
       assert Source("hello").isparseable()
       assert Source("if 1:\n  pass").isparseable()
       assert Source(" \nif 1:\n  pass").isparseable()
       assert not Source("if 1:\n").isparseable() 
->     assert not Source(" \nif 1:\npass").isparseable()