[llvm-bugs] [Bug 46856] New: CTAD fails on nested templated class

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46856

            Bug ID: 46856
           Summary: CTAD fails on nested templated class
           Product: clang
           Version: 10.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++17
          Assignee: unassignedclangbugs at nondot.org
          Reporter: narut.se at gmail.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

The following snippet doesn't compile on clang (10), due to CTAD failing. It
occurs when the parent class is templated:

template <class U>
struct X {      
        template <class T> struct Y {
                T y;
                Y(T t) : y(t) {}                
        };
        auto test() const {
                return Y(10);
        }
};

auto test() {
    return X<int>().test();
}


The snippet compiles on msvc and gcc:
https://godbolt.org/z/Wq6Paf

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