Compiler Error C3201

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the template parameter list for class template 'template' does not match the template parameter list for template parameter 'template'

You passed a class template in the argument to a class template that does not take a template parameter.

// C3201.cpp
template<typename T1, typename T2>
class X1
{
};

template<template<typename T> class U = X1>   // C3201
class X2
{
};