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Language

C++

Compiler

clang HEAD 12.0.0 (https://github.com/llvm/llvm-project.git 783ba64a8950768d412555abd52bbc65156d4fb5)

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:3:10: warning: duplicate 'volatile' declaration specifier [-Wduplicate-decl-specifier]
volatile volatile int i;   // C4114
         ^~~~~~~~~
1 warning generated.
Exit Code:
0