As this is not a bug in expr (since it doesn't use GMP in a way that
could trigger the bug) I'm closing the bug report.
- bug#79805: possible missing null check in tostring() Ray steven
- bug#79805: possible missing null check in tostring() Paul Eggert
- bug#79805: possible missing null check in tostring() Paul Eggert
- bug#79805: possible missing null check in tostring() Grisha Levit
- bug#79805: possible missing null check in tostring() Paul Eggert
