The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2019.09.06.11.12.06 christos src/distrib/sets/lists/base/shl.mi,v 1.870 2019.09.06.11.12.06 christos src/distrib/sets/lists/debug/shl.mi,v 1.228 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2019.09.html#2019.09.06.11.12.06