[llvm-bugs] [Bug 47333] New: templetized operator<< isn't matched in a namespace

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47333

            Bug ID: 47333
           Summary: templetized operator<< isn't matched in a namespace
           Product: clang
           Version: trunk
          Hardware: PC
                OS: FreeBSD
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++17
          Assignee: unassignedclangbugs at nondot.org
          Reporter: yuri at tsoft.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

Created attachment 23900
  --> https://bugs.llvm.org/attachment.cgi?id=23900&action=edit
testcase-templetized-operator-in-namespace.cpp

The attached testcase testcase-templetized-operator-in-namespace.cpp fails to
compile:

> testcase-templetized-operator-in-namespace.cpp:38:22: error: invalid operands to binary expression ('basic_ostream<char, std::__1::char_traits<char>>' and 'std::vector<int>')
>                 std::cout << " v=" << ee << std::endl;
>                 ~~~~~~~~~~~~~~~~~~ ^  ~~

The locally defined template "template<typename T> std::ostream&
operator<<(std::ostream &os, std::vector<T> &v)" isn't matched in a class
method.

However, removing the namespace X (flattening it), or removing the unrelated
"std::ostream& operator<<(std::ostream &os, E e)" make this code to compile.

The template should match regardless of the code being in a namespace, or
presence of operator<< for other types.

Observed on llvm-devel-12.0.d20200811 in FreeBSD 12.1

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