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Language

C++

Compiler

clang HEAD 12.0.0 (https://github.com/llvm/llvm-project.git 4013bab9c4a5fe634be6271779a99bc158c3e396)

Options
Warnings
Boost 1.73.0
C++2a(GNU)
no pedantic

$ clang++ prog.cc -Wall -Wextra -I/opt/wandbox/boost-1.73.0/clang-head/include -std=gnu++2a 
prog.cc:3:12: error: unknown type name 'a'
void func( a, b, ...)   // C4202
           ^
prog.cc:3:15: error: unknown type name 'b'
void func( a, b, ...)   // C4202
              ^
prog.cc:3:22: error: expected ';' after top level declarator
void func( a, b, ...)   // C4202
                     ^
                     ;
prog.cc:5:1: error: expected unqualified-id
{}
^
4 errors generated.
Exit Code:
1