[llvm-bugs] [Bug 45281] New: user defined deduction guide isn't found in case of nested template class if outer template argument is itself a template parameter

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45281

            Bug ID: 45281
           Summary: user defined deduction guide isn't found in case of
                    nested template class if outer template argument is
                    itself a template parameter
           Product: clang
           Version: trunk
          Hardware: PC
                OS: MacOS X
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++17
          Assignee: unassignedclangbugs at nondot.org
          Reporter: holger at pirk.name
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

Following up on https://bugs.llvm.org/show_bug.cgi?id=34520, the following does
not work in clang: 
```
#include <string>

template <class>
struct Foo {
    template <class T>
    struct Bar {
        Bar(T) { }
    };
    Bar(char const*) -> Bar<std::string>;
};

int main() {
    Foo<int>::Bar bar("abc");
    static_cast<void>(bar);
}

template <typename T> void templated() { Foo<T>::Bar bar("abc"); };
```
It is the same example code but the last line is added. MSVC does not seem to
have this problem (according to godbolt.org).

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