Fix broken @@@<n>/@@@rest references in quasiliterals.

* parser.y (quasi_meta_helper): When obj is a sys:var,
leave it alone; don't add another layer of var. Also,
do the same if it is a sys:expr.

* tests/012/quasi.tl: Added test case.

1 files changed, 2 insertions, 2 deletions

diff --git a/parser.y b/parser.y
index 04be6aa7..54cc494b 100644
--- a/parser.y
+++ b/parser.y
@@ -1372,8 +1372,8 @@ static val quasi_meta_helper(val obj)
   if (atom(obj))
     goto expr;
 
-  if (first(obj) == var_s)
-    goto var;
+  if (first(obj) == var_s || first(obj) == expr_s)
+    return obj;
 
 expr:
   return rlcp(cons(expr_s, obj), obj);