(([ loc ], t @+ filter_open g, [],`BranchTag)
:: (loc_tl, t', k', tag) :: s))
| Shift, _ -> fail (lazy "can't shift goals here")
+ | Pos i_s, ([ loc ], [], [],`BranchTag) :: (g', t', k', tag) :: s
+ when is_fresh loc ->
+ let l_js = List.filter (fun (i, _) -> List.mem i i_s) (g' @+ [loc]) in
+ new_stack
+ ((l_js, [], [],`BranchTag)
+ :: ([ loc ] @+ g' @- l_js, t', k', tag) :: s)
+ | Pos i_s, (g, t, k,`BranchTag) :: (g', t', k', tag) :: s ->
+ let l_js = List.filter (fun (i, pos) -> List.mem i i_s) g' in
+ new_stack
+ ((l_js, [], [],`BranchTag)
+ :: (g' @- l_js, t' @+ filter_open g, k', tag) :: s)
+(*
| Pos i_s, ([ loc ], [], [],`BranchTag) :: (g', t', k', tag) :: s
when is_fresh loc ->
let l_js = List.filter (fun (i, _) -> List.mem i i_s) g' in
new_stack
((l_js, [], [],`BranchTag)
:: (g' @- l_js, t' @+ filter_open g, k', tag) :: s)
+*)
| Pos _, _ -> fail (lazy "can't use relative positioning here")
+ | Wildcard, ([ loc ] , t, k, `BranchTag) :: (g', t', k', tag) :: s
+ when is_fresh loc ->
+ new_stack
+ (([loc] @+ g', [], [], `BranchTag)
+ :: ([], t' @+ k, k', tag) :: s)
+ | Wildcard, (g, t, k, `BranchTag) :: (g', t', k', tag) :: s ->
+ new_stack
+ ((g', [], [], `BranchTag)
+ :: ([], t' @+ filter_open g @+ k, k', tag) :: s)
+(*
| Wildcard, (g, t, k, `BranchTag) :: (g', t', k', tag) :: s
when g = [] || is_fresh (List.hd g) ->
new_stack
((g', [], [], `BranchTag)
:: ([], t' @+ filter_open g @+ k, k', tag) :: s)
+*)
| Wildcard, _ -> fail (lazy "can't use wildcard here")
| Merge, (g, t, k,`BranchTag) :: (g', t', k', tag) :: s ->
new_stack ((t @+ filter_open g @+ g' @+ k, t', k', tag) :: s)