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The new() constraint must be the last constraint specified
When using multiple constraints, list all other constraints before the new() constraint.
Example
The following sample generates CS0401.
// CS0401.cs
// compile with: /target:library
using System;
class C<T> where T : new(), IDisposable {} // CS0401
class D<T> where T : IDisposable
{
static void F<U>() where U : new(), IDisposable{} // CS0401
}