std::cout breaks after nullptr

[Jonny Grant <jg@xxxxxxxx>]

Hello!

Is this an issue? G++ doesn't identify problem in this test case doesn't 
when compiling or running.

"hello" is not displayed, std::cout never works again after nullptr.


// g++-8 -Wall -Wextra -Wconversion-null -Wno-nonnull-compare 
-Wzero-as-null-pointer-constant 
-fsanitize=null,returns-nonnull-attribute,signed-integer-overflow,leak,undefined,address 
-o cout cout.cpp
#include <iostream>
int main()
{
    const char * p = nullptr;
    std::cout << p;
    std::cout << "hello";
}