It will not compile, because constraint is not specified (there is a call of public constructor without parameters, but not all reference types have it). In order for the code to compile it's required to add a constraint, for example:

 
internal sealed class SomeGenericClass<T> where T : struct {
   public static T SomeMethod() { 
       return new T(); 
   } 
}
 

or

 
internal sealed class SomeGenericClass<T> where T : new() { 
   public static T SomeMethod() { 
       return new T(); 
    } 
}