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Language

C++

Compiler

clang HEAD 9.0.0 (https://github.com/llvm-mirror/clang.git 7490b7d8ede38d701112ea7f4c50313af18fbf53) (https://github.com/llvm-mirror/llvm.git dca684aae6c3df76f1f802848e7c273f3208f5e8)

Options
Warnings
Boost 1.70.0
C++2a(GNU)
no pedantic

$ clang++ prog.cc -Wall -Wextra -I/opt/wandbox/boost-1.70.0/clang-head/include -std=gnu++2a
ns1::bar
ns2::bar
Exit Code:
0