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Here's a test case that doesn't require doctest trickery:
import inspect, linecache
fn, source = '<test>', 'def x(): pass\n'
getlines = linecache.getlines
def monkey(filename, module_globals=None):
 if filename == fn:
 return source.splitlines(True)
 else:
 return getlines(filename, module_globals)
linecache.getlines = monkey
exec compile(source, fn, 'single') in globals()
inspect.getsource(x)