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Compiler Error C3179

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an unnamed managed or WinRT type is not allowed

All CLR and WinRT classes and structs must have names.

The following sample generates C3179 and shows how to fix it:

// C3179a.cpp
// compile with: /clr /c
typedef value struct { // C3179
// try the following line instead
// typedef value struct MyStruct {
   int i;
} V;