Fix pythoneval tests

Author: cdce8p

test-data/unit/pythoneval.test

@@ -254,7 +254,7 @@ reveal_type(open('x', mode))
 [out]
 _program.py:1: note: Revealed type is "_io.TextIOWrapper[_io._WrappedBuffer]"
 _program.py:2: note: Revealed type is "_io.TextIOWrapper[_io._WrappedBuffer]"
-_program.py:3: note: Revealed type is "_io.BufferedReader"
+_program.py:3: note: Revealed type is "_io.BufferedReader[_io._BufferedReaderStream]"
 _program.py:5: note: Revealed type is "typing.IO[Any]"
 
 [case testOpenReturnTypeInferenceSpecialCases]
@@ -263,8 +263,8 @@ reveal_type(open(file='x', mode='rb'))
 mode = 'rb'
 reveal_type(open(mode=mode, file='r'))
 [out]
-_testOpenReturnTypeInferenceSpecialCases.py:1: note: Revealed type is "_io.BufferedReader"
-_testOpenReturnTypeInferenceSpecialCases.py:2: note: Revealed type is "_io.BufferedReader"
+_testOpenReturnTypeInferenceSpecialCases.py:1: note: Revealed type is "_io.BufferedReader[_io._BufferedReaderStream]"
+_testOpenReturnTypeInferenceSpecialCases.py:2: note: Revealed type is "_io.BufferedReader[_io._BufferedReaderStream]"
 _testOpenReturnTypeInferenceSpecialCases.py:4: note: Revealed type is "typing.IO[Any]"
 
 [case testPathOpenReturnTypeInference]
@@ -278,7 +278,7 @@ reveal_type(p.open(mode))
 [out]
 _program.py:3: note: Revealed type is "_io.TextIOWrapper[_io._WrappedBuffer]"
 _program.py:4: note: Revealed type is "_io.TextIOWrapper[_io._WrappedBuffer]"
-_program.py:5: note: Revealed type is "_io.BufferedReader"
+_program.py:5: note: Revealed type is "_io.BufferedReader[_io._BufferedReaderStream]"
 _program.py:7: note: Revealed type is "typing.IO[Any]"
 
 [case testPathOpenReturnTypeInferenceSpecialCases]