How do i...how to resolve compile error re / template parameter shadowing

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templates

C++20

Greetings Kind Regards
The routines below do not compile w/ error messages shown. I am mostly interested in the first routine assert_Search_results The error refers to a template parameter being shadowed. I do not know what that means. I seek your kind assistance. Thank You Kindly

Solution found. See below.

import std.core;
using namespace std;

#define LINE_FUNCSIG cout << __LINE__ << ' ' << __FUNCSIG__ << endl;

namespace TREE
{
	template<typename treeType, template<typename> typename keyReferenceWrapper, template<typename> typename valueReferenceWrapper>
	struct key_x_value {};
}

template<typename T>
struct non_reference_wrapper {};

struct cContiguousIntervalTree
{
	using this_tree_type = cContiguousIntervalTree;

	template<typename T>
	using key_reference_wrapper = non_reference_wrapper<T>;

	template<template<typename> typename valueReferenceWrapper>
	using key_x_value_template = TREE::key_x_value<this_tree_type, key_reference_wrapper, valueReferenceWrapper>;

	template<template<typename> typename referenceWrapper>
	using intersecting_x_datum_template = key_x_value_template<referenceWrapper>;
};

// does not compile
// error C2947 : expecting '>' to terminate template - argument - list, found '<'
// error C7576 : declaration of 'referenceWrapper' shadows a template parameter
// error C2988 : unrecognizable template declaration / definition
// error C2143 : syntax error : missing ')' before '>'
// error C2059 : syntax error : '>'
// error C2059 : syntax error : ')'
// Done building project "hello_world.vcxproj" --FAILED.
template<typename treeType, template<typename> class referenceWrapper>
void assert_Search_result(const vector<typename treeType::intersecting_x_datum_template<referenceWrapper>>);

// does not compile
// error C2988 : unrecognizable template declaration / definition
// error C2143 : syntax error : missing ')' before '<'
// error C2143 : syntax error : missing ';' before '<'
// error C2059 : syntax error : '<'
// error C2059 : syntax error : ')'
// Done building project "hello_world.vcxproj" --FAILED.
template<typename T, typename U>
void foo(typename T::key_reference_wrapper);

// much to my amazement compiles
template<typename T, typename U>
void goo(typename T::U); 

Solution:

template<typename treeType, template<typename> typename referenceWrapper, typename U>
void assert_Search_result(typename treeType:: template intersecting_x_datum_template<referenceWrapper<U>>);

Invoked as:

assert_Search_result<defined_tree_type_here, defined_reference_wrapper_type_here>(argument_here);

What I have tried:

Examined cppreference page link below re / dependent type. Was not helpful. Examined Microsoft page link below re / error C7576. Was not helpful. Searched web for "template shadow". Found nothing. Examined code above to determine why all these underlines. Was not helpful. Finally learned < and > need to be converted to &lt and &gt
Dependent names - cppreference.com< / a>[ ^ ]
Compiler errors C7500 through C7999 | Microsoft Learn[ ^ ]