We're creating a std::string of a certain large size, but only initializing it with a string of size 1 here. From the std::string constructor docs, it looks like instead of std::string("A", size), we should use std::string(size, "A") to fill the string with the string "A" repeated.

Note that this code doesn't exist on versions after 5.0, and so will only need to change on v5.0 and v4.4.