Further fix supporting test code

The problem that original fix[^1] was trying to defensively account for
actually already exists in `&take` calls that aren't a last statement
of a `for` loop and the Seq gets sunk, exploding the test.

[1] a8d6091

S03-operators/repeat.t

@@ -199,7 +199,7 @@ is-deeply (|() xx *)[^5], (Nil, Nil, Nil, Nil, Nil),
 # RT #121327
 {
     my @result = gather {
-        for ^2 { my @b = 1 xx 4; take (@b.shift xx 2) xx 2; Nil }
+        for ^2 { my @b = 1 xx 4; my $ = take (@b.shift xx 2) xx 2; Nil }
     }
     is-deeply @result.map(*.list).list, (((1, 1), (1, 1)), ((1, 1), (1, 1))),
         'Nested xx in for-loop';