portage-ng / portage / sys-apps / memtest86+ / 6.20-r1
pmerge --pretend --verbose
[ebuild  N     ] sys-apps/memtest86+-6.20-r1::gentoo USE="bios64 boot uefi64 (-bios32) (-iso32) -iso64 -secureboot (-uefi32)" 227.0 KiB

Total: 1 package (1 new), Size of downloads: 227.0 KiB


 * Running sanity checks...
>>> sys-apps/memtest86+-6.20-r1: failed pkg_pretend
 /Volumes/Disk 1/gentoo-prefix/usr/lib/pkgcore/lib/pkgcore/ebd/.generated/libs/8/pkg_pretend: line 144: [[: invalid regular expression `': empty (sub)expression
  * ERROR: sys-apps/memtest86+-6.20-r1:: failed (pretend phase):
  *   USE flag 'boot' not in IUSE for sys-apps/memtest86+-6.20-r1
  * 
  * Call stack:
  *    isolated-functions.bash, line  333:  called pkg_pretend
  *                ebuild.bash, line 1370:  called use 'boot'
  *                pkg_pretend, line  145:  called die
  * 
  * Working directory: '/var/tmp/portage'

!!! Sanity checks failed, exiting...

Wall time
0.706 s vs. 0.004 s for portage-ng