func subTest(t *testing.T, tag string, basename string, gcflags string, moreargs ...string) {
	t.Run(tag+"-"+basename, func(t *testing.T) {
		if t.Name() == "TestNexting/gdb-dbg-i22558" {
			testenv.SkipFlaky(t, 31263)
		}
		testNexting(t, basename, tag, gcflags, 1000, moreargs...)
	})
}

// skipSubTest is the same as subTest except that it skips the test if execution is not forced (-f)