tests/errors(error2) $ lfortran assignment_01.f90 --show-ast
ERROR 3
ERROR 2
(TranslationUnit 
    [(Module 
        assignment_01 
        (TriviaNode 
            [(EndOfLine)
            (EndOfLine)] 
            []
        ) 
        [] 
        [] 
        [] 
        [(Subroutine 
            f 
            [(a)
            (b)] 
            [] 
            () 
            (TriviaNode 
                [] 
                [(EndOfLine)
                (EndOfLine)]
            ) 
            [] 
            [] 
            [] 
            [(Declaration 
                (AttrType 
                    TypeInteger 
                    [] 
                    () 
                    None
                ) 
                [(AttrIntent 
                    InOut
                )] 
                [(a 
                [] 
                [] 
                () 
                None 
                ())
                (b 
                [] 
                [] 
                () 
                None 
                ())] 
                (TriviaNode 
                    [] 
                    [(EndOfLine)
                    (EndOfLine)]
                )
            )] 
            [(= 
                0 
                b 
                b 
                (TriviaNode 
                    [] 
                    [(EndOfLine)
                    (EndOfLine)]
                )
            )] 
            []
        )]
    )]
)