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Compiler Error C3215

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'type1' : generic type parameter already constrained by 'type2'

A constraint was specified more than once.

For more information on generics, see Generics.

The following sample generates C3215:

// C3215.cpp
// compile with: /clr
interface struct A {};

generic <class T>
where T : A,A
ref class C {};   // C3215

Possible resolution:

// C3215b.cpp
// compile with: /clr /c
interface struct A {};

generic <class T>
where T : A
ref class C {};