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Language

C++

Compiler

clang HEAD 12.0.0 (https://github.com/llvm/llvm-project.git 9087209314caafed4b232d4a66287f2d16054ad3)

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:22:40: warning: unused parameter 'a' [-Wunused-parameter]
    TripWarning4868(HasCopyConstructor a, HasCopyConstructor b) {}
                                       ^
prog.cc:22:62: warning: unused parameter 'b' [-Wunused-parameter]
    TripWarning4868(HasCopyConstructor a, HasCopyConstructor b) {}
                                                             ^
2 warnings generated.

Constructing 1
Constructing 2
Exit Code:
0