examples: lang: Fixup a few examples

We might change unification to allow naked single strings with fancier
unification, but let's leave it as is for now and see how often it comes
up.

examples/lang/class-include-nested0.mcl

@@ -1,12 +1,12 @@
 $top = "top-level"
 class base($s) {
-	test "middle " + $s {}
+	test ["middle " + $s,] {}
 	$middle = "inside base"
 }
 
 # syntactic sugar for the equivalent of defining a class `inner` inside of base.
 class base:inner($s) {
-	test "inner " + $s {}
+	test ["inner " + $s,] {}
 
 	$last = "i am inner and i can see " + $middle
 }
@@ -14,6 +14,6 @@ class base:inner($s) {
 include base("world") as b1
 include b1.inner("hello") as b2	# inner comes out of `base`
 
-test $top {}
-test $b1.middle {}
-test $b2.last {}
+test [$top,] {}
+test [$b1.middle,] {}
+test [$b2.last,] {}