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Compiler Error CS0523 

Error Message

Struct member 'struct2 field' of type 'struct1' causes a cycle in the struct layout

The definitions of two structs include recursive references. Change the struct definitions such that each does not define itself on the other. This limitation applies only to structs, since structs are value types. If using recursive references, declare your types as classes.

The following sample generates CS0523:

// CS0523.cs
// compile with: /target:library
struct RecursiveLayoutStruct1
   public RecursiveLayoutStruct2 field;

struct RecursiveLayoutStruct2
   public RecursiveLayoutStruct1 field;   // CS0523

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