expected_function

Hello,

does any one know why the expect_function has a member first?

I was trying to see why i do not get on_error<fail> code and it seems, that 
the expect_function class has a logic that prevents some of the exceptions.
Most notably there is a member called first, which eats all the exceptions
in the beginning.

I am trying to parse the word 

imports,

    qi::rule < iterator, std::string(), ascii::space_type >     
m_identifier;
    m_identifier = raw[ lexeme[(alpha | '_') > *( alpha | digit | '_')] ];

imports is parsed
1imports is not parsed, however this code is not called:
boost::throw_exception(Exception(first, last, component.what(context)));

If i comment the logic seems to work fine. I see this is connected with some
multipass parsing, which i do not use.





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