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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:8:8: error: non-const lvalue reference to type 'C' cannot bind to a temporary of type 'C'
   C & rC = C();   // C4239
       ^    ~~~
prog.cc:10:4: warning: expression result unused [-Wunused-value]
   rC2;
   ^~~
1 warning and 1 error generated.
Exit Code:
1