pylint #18862 E0601 false positive with lambda functions [resolved]

James Lingard reported...

The following program:

def f():
   g = lambda: x
   x = 1
   print g()

generates the following unnecessary error:

E0601:  2:f.<lambda>: Using variable 'x' before assignment

Note that the following program doesn't generate the error:

def f():
   def g(): return x
   x = 1
   print g()

I think it would make sense for this warning to treat lambda expressions the same as function definitions.

done in0.19.0
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