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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:9:11: warning: direct base 'A' is inaccessible due to ambiguity:
    class C -> class A
    class C -> class B -> class A [-Winaccessible-base]
class C : public A, public B { // C4584
          ^~~~~~~~
1 warning generated.
Exit Code:
0