C++
clang HEAD 12.0.0 (https://github.com/llvm/llvm-project.git 1c45220028a8aa39ad2f26c8c3c6234d1a816086)
$ clang++ prog.cc -Wall -Wextra -I/opt/wandbox/boost-1.73.0/clang-head/include -std=c++11 prog.cc:17:10: error: virtual function 'Setup' has a different return type ('void') than the function it overrides (which has return type 'Test::Setup_should_be_spelled_SetUp *')
void Setup() override {} // override するものがないので NG
~~~~ ^
prog.cc:9:44: note: overridden virtual function is here
virtual Setup_should_be_spelled_SetUp* Setup() { return NULL; } // override して欲しい関数とは違う戻り値にしておく
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^
prog.cc:18:18: error: only virtual member functions can be marked 'override'
void setup() override {} // override するものがないので NG
^~~~~~~~~
prog.cc:25:10: error: virtual function 'Setup' has a different return type ('void') than the function it overrides (which has return type 'Test::Setup_should_be_spelled_SetUp *')
void Setup() {} // return type 違いでエラー
~~~~ ^
prog.cc:9:44: note: overridden virtual function is here
virtual Setup_should_be_spelled_SetUp* Setup() { return NULL; } // override して欲しい関数とは違う戻り値にしておく
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^
3 errors generated.