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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:1:6: error: ISO C++ forbids forward references to 'enum' types
enum Hoge;
     ^
prog.cc:5:5: error: statement requires expression of integer type ('Hoge' invalid)
    switch(*p)
    ^      ~~
2 errors generated.
Exit Code:
1