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Language

C++

Compiler

clang HEAD 10.0.0 (https://github.com/llvm-mirror/clang.git 65acf43270ea2894dffa0d0b292b92402f80c8cb) (https://github.com/llvm-mirror/llvm.git 2c4ca6832fa6b306ee6a7010bfb80a3f2596f824)

Options
Warnings
Boost 1.71.0
C++2a(GNU)
no pedantic
Raw compiler options
-Wno-unused-variable

$ clang++ prog.cc -Wall -Wextra -I/opt/wandbox/boost-1.71.0/clang-head/include -std=gnu++2a -Wno-unused-variable

Linux like OS 
 __cplusplus:		 201707 
 __cpp_char8_t:		 201811 
 compiler __VERSION__:	 Clang 10.0.0 (https://github.com/llvm-mirror/clang.git 65acf43270ea2894dffa0d0b292b92402f80c8cb) (https://github.com/llvm-mirror/llvm.git 2c4ca6832fa6b306ee6a7010bfb80a3f2596f824), 

have_cuchar:		 0

char32_t *, Converting to 'char *', and then printing: ひらがな
Done ...

char8_t *, Converting to 'char *', and then printing: ::c8rtomb() is undecided, Nov 19 2019
Done ...
Exit Code:
42