Hi,

When building saferith on s390x, it fails, as arith_s390x_test.go states package big rather than package saferith.

Specifically, this is failing on Debian Unstable s390x. You can see the full Debian CI log here. Relevant part from log:

found packages saferith (arith.go) and big (arith_s390x_test.go) in <BUILDPATH>/saferith

AFAIK the solution to change out package big for package saferith in arith_s390x_test.go

Thanks!