[llvm-bugs] [Bug 40238] New: fails to deduce template specialization in friend declaration

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40238

            Bug ID: 40238
           Summary: fails to deduce template specialization in friend
                    declaration
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rhainin1 at binghamton.edu
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

clang fails to deduce that the friend declaration refers to ::func<int> in the
below

```
template <typename T>
void func(T);

class Cls {
    friend void ::func(int);
};
```

Rejecting with:

```
error: out-of-line declaration of 'func' does not match any declaration in the
global namespace
    friend void ::func(int);
                  ^~~~
```

I believe this should be allowed by [temp.friend]/1.3:
http://eel.is/c++draft/temp.friend#1.3

see discussion here: https://stackoverflow.com/q/54055575/1013719

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