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E2388: Argument list of specialization cannot be identical to the parameter list of primary template (C++)

When declaring a partial specialization, its specialization argument list must differ in some way from its basic parameter list. For example: 

template<class T>

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class foo;

 

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template<class T>

 

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class foo<T *>;     // OK: is more specialized than primary template

 

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template<class T>

 

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class foo<T>;       // error: identical to primary template
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