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Language

C++

Compiler

clang HEAD 12.0.0 (https://github.com/llvm/llvm-project.git 344a3d0bc0fb0868b519c3342b4982d6121eece3)

Options
Warnings
Boost 1.73.0
C++2a
no pedantic

$ clang++ prog.cc -Wall -Wextra -I/opt/wandbox/boost-1.73.0/clang-head/include -std=c++2a 
prog.cc:11:10: warning: case value not in enumerated type 'Hoge' [-Wswitch]
    case 10:
         ^
prog.cc:9:12: warning: enumeration values 'A', 'B', and 'C' not handled in switch [-Wswitch]
    switch(a)
           ^
2 warnings generated.
Exit Code:
0