fixed frontmatter detection

lib/tree.hoon

@@ -1,20 +1,23 @@
 /-  tree-include
+!:
 |%
 ++  baff  |*([a=(unit) b=(trap)] ?^(a a *b))
 ++  find-in-tree
   |*  [paz=fist:jo fun=$+(* (unit))]
-  |=  a=json  ^+  *fun
-  %+  biff  (paz a)
-  |*  [b=(list json) c=*]  ^+  *fun
-  %+  baff  (fun c)
-  |.
-  ?~  b  ~
-  (baff ^^$(a i.b) |.(^$(b t.b)))
+  |=  a=(list json)
+  |^  (try)
+  ++  try
+    |.  ^+  *fun
+    ?~  a  ~
+    %+  biff  (paz i.a)
+    |*  [b=(list json) c=*]  ^+  *fun
+    (baff (baff (fun c) try(a b)) try(a t.a))
+  --
 ::
 ++  json-front
   |=  a=json  ^-  json
   =-  (fall `(unit json)`- ~)
-  %+  biff  ((ot body/some ~):jo a)
+  %+  biff  ((ar some):jo a)
   %+  find-in-tree  (ot c/(ar some) gn/so ga/(om so) ~):jo
   |=  [nom=span atr=(map span cord)]  ^-  (unit json)
   ?.  (~(has by atr) 'urb:front')  ~
@@ -24,16 +27,17 @@
 ++  read-schem  
   =<  (cook to-noun (cook to-tree apex))
   |%
-  ++  data  $|(term [n=@ l=data r=data])
+  ++  noun  $|(term [noun noun])       ::  shadow
+  ++  data  $|(term [n=@ l=noun r=data])
   ++  apex  ;~(plug sym (star ;~(plug delim sym)))
   ++  delim  ;~(pose (cold 0 dot) (cook lent (plus cab)))
-  ++  to-noun  |=(a=data ?@(a a [$(a l.a) $(a r.a)]))
+  ++  to-noun  |=(a=data ?@(a a [l.a $(a r.a)]))
   ++  to-tree
     |=  [acc=data a=(list ,[p=@u q=term])]
     %+  roll  a  =<  .(acc ^acc)
     |=  [[n=@u v=term] acc=data]
     ?@  acc            [n acc v]
-    ?:  (gth n n.acc)  [n acc v]
+    ?:  (gth n n.acc)  [n (to-noun acc) v]
     acc(r $(acc r.acc))
   --
 --