g++ treats Rectangle as a keyword

[Kelly Mandrake]

It seems Rectangle is being treated as a reserved keyword, if used for 
example as a class identifier i.e.

class Rectangle{...};

the compiler (g++) will generate an error stateing there is no declaration 
of a Rectangle wherever an instance of the class is created

Rectangle Rect1();

Rectangle is not a native keyword to my knowledge.  Is there a reason?

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