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macro compile error

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Hello, I have the following macro definitions: #define AAA(s1, s2) s1##s2 #define BBB(s1, s2) AAA(s1, s2) The sentence '' char AAA(x, __LINE__) = ''a''; '' can be compiled right. However the sentence '' char BBB(x, __LINE__) = ''a''; '' will fail compiling. Why? My compiler is VC.net.

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