Allow . as {$a:$b} destructuring

tests/jq.test

@@ -720,6 +720,10 @@ null
 {"a":1, "b":[2,{"d":3}]}
 [1,2,3]
 
+. as {$a, $b:[$c, $d]}| [$a, $b, $c, $d]
+{"a":1, "b":[2,{"d":3}]}
+[1,[2,{"d":3}],2,{"d":3}]
+
 # Destructuring with alternation
 .[] | . as {$a, b: [$c, {$d}]} ?// [$a, {$b}, $e] ?// $f | [$a, $b, $c, $d, $e, $f]
 [{"a":1, "b":[2,{"d":3}]}, [4, {"b":5, "c":6}, 7, 8, 9], "foo"]