+$obj = "apple ${\($x->new)} pear"
+####
+$obj = "apple @{[$x->new]} pear"
+####
+$obj = "apple ${\($y->new)} pear"
+####
+$obj = "apple @{[$y->new]} pear"
+####
+$obj = "apple ${\($x->$cb)} pear"
+####
+$obj = "apple @{[$x->$cb]} pear"
+####
+$obj = "apple ${\($y->$cb)} pear"
+####
+$obj = "apple @{[$y->$cb]} pear"