~/P/snippets $ cat > oob.cpp
#include <iostream>
int main() {
    std::cout << "Hello, world!"[1000];
}
~/P/snippets $ clang++ -fsanitize=undefined -o oob oob.cpp
~/P/snippets $ ./oob
oob.cpp:3:18: runtime error: index 1000 out of bounds for type 'const char [14]'
8⏎
~/P/snippets $