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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
Raw compiler options
-Weverything

$ clang++ prog.cc -Wall -Wextra -I/opt/wandbox/boost-1.73.0/clang-head/include -std=c++2a -Weverything
prog.cc:5:19: error: template parameter redefines default argument
template <class T=int> struct A { };
                  ^
prog.cc:3:19: note: previous default template argument defined here
template <class T=int> struct A;   // forward declaration
                  ^
1 error generated.
Exit Code:
1