What does it mean by the suggestion give by the IDE? (using VS 2010)

There is no constructor of baseClass_2 which takes the suggested parameter(const baseClass_2 &). So, why this is showing up?
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Implicitly defined copy constructor.
There are special member functions which get defined by default when you not explicitly declare / define them:
Note that the default constructor will not get defined when you provide any other constructor besides the copy constructor.