Use an equally valid implementation of one test.

What GLR broke here will definitely be addressed,
and isn't related to the tested functionality.  So,
tweak the test in the interest of reducing noise.

S02-types/subset.t

@@ -55,7 +55,7 @@ dies-ok { my Digit $x = 3.1 },
     lives-ok { my Subhash $a = {} },
              'can create subset of hash';
 
-    subset Person of Hash where { .keys.sort ~~ <firstname lastname> }
+    subset Person of Hash where { .keys.sort ~~ ['firstname', 'lastname'] }
     lives-ok { my Person $p = { :firstname<Alpha>, :lastname<Bravo> } },
              'can create subset of hash with where';
     dies-ok { my Person $p = { :first<Charlie>, :last<Delta> } },