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The class type constraint 'constraint' must come before any other constraints
When a generic type or method has a class type constraint, that constraint must be listed first. To avoid this error, move the class type constraint to the beginning of the constraint list.
Example
The following sample generates CS0406.
// CS0406.cs
// compile with: /target:library
interface I {}
class C {}
class D<T> where T : I, C {} // CS0406
class D2<T> where T : C, I {} // OK