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Compiler Error C3807

'type' : a class with the ComImport attribute cannot derive from 'type2', only interface implementation is allowed

A type that derived from ComImportAttribute can only implement an interface.

The following sample generates C3807.

// C3807.cpp
// compile with: /clr /c
ref struct S {};
interface struct I {};

[System::Runtime::InteropServices::ComImportAttribute()]
ref struct S1 : S {};   // C3807
ref struct S2 : I {};
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