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Language

C++

Compiler

clang HEAD 12.0.0 (https://github.com/llvm/llvm-project.git a8b8a9374a3c555ac8528fc37b92935554083b9f)

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:1:7: warning: abstract class is marked 'final' [-Wabstract-final-class]
class A final
      ^
prog.cc:4:18: note: unimplemented pure virtual method 'f' in 'A'
    virtual void f() = 0;
                 ^
1 warning generated.
Exit Code:
0