C++
gcc HEAD 13.0.0 20220725 (experimental)
$ g++ prog.cc -Wall -Wextra -std=c++2b -pedantic
/usr/bin/ld: /lib/x86_64-linux-gnu/crt1.o: in function `_start': (.text+0x24): undefined reference to `main' collect2: error: ld returned 1 exit status