[Bug c++/104319] better error message for parsing error when >= or >> ends a template variable.

[nickhuang99 at hotmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104319

--- Comment #10 from qingzhe huang <nickhuang99 at hotmail dot com> ---
Here I have another test case. It involves an anonymous template argument which
confuses me for a lot at the time which clang is doing a great job to clarify
the reason for me.

https://www.godbolt.org/z/YGfMncGeW

template <typename T=int, 
    std::enable_if_t<std::is_integral<T>::value, 
    bool>=true   //there should be a space in ">="
    >  
struct TestStruct{};