segfault on initial word completion

[Grisha Levit]

$ bash --rcfile <(echo 'complete -C: -I') -i <<<$'; \cA\t'
bash-5.2$ bash: xmalloc: cannot allocate 18446744073709551615 bytes
$ bash --rcfile <(echo 'complete -C: -I') -i <<<$';\cA \t'
bash-5.2$  Segmentation fault: 11