diff options
| author |  Maxime Dénès <mail@maximedenes.fr> | 2017-11-03 10:54:11 +0100 |
|---|---|---|
| committer | Maxime Dénès <mail@maximedenes.fr> | 2017-11-03 10:54:11 +0100 |
| commit | 97e82c1a520382ec34cfedcc55b5190126b05703 (patch) | |
| tree | d3cb12a29b9d90db3063f2488cba4961b8b46c81 /pretyping | |
| parent | 22c3a0edacef219206ad216b3cce2aa73d9ce2a6 (diff) | |
| parent | de7d2fdb97975dcd94005bb6fa79a312c8afa017 (diff) | |
Merge PR #6037: Fixing #5401 (printing of patterns with bound anonymous variables).
Diffstat (limited to 'pretyping')
| -rw-r--r-- | pretyping/patternops.ml | 25 | ||||
| -rw-r--r-- | pretyping/patternops.mli | 2 |
2 files changed, 27 insertions, 0 deletions
diff --git a/pretyping/patternops.ml b/pretyping/patternops.ml index 3b3ad021e..aaa946706 100644 --- a/pretyping/patternops.ml +++ b/pretyping/patternops.ml @@ -96,6 +96,31 @@ let rec occur_meta_pattern = function | PMeta _ | PSoApp _ -> true | PEvar _ | PVar _ | PRef _ | PRel _ | PSort _ | PFix _ | PCoFix _ -> false +let rec occurn_pattern n = function + | PRel p -> Int.equal n p + | PApp (f,args) -> + (occurn_pattern n f) || (Array.exists (occurn_pattern n) args) + | PProj (_,arg) -> occurn_pattern n arg + | PLambda (na,t,c) -> (occurn_pattern n t) || (occurn_pattern (n+1) c) + | PProd (na,t,c) -> (occurn_pattern n t) || (occurn_pattern (n+1) c) + | PLetIn (na,b,t,c) -> + Option.fold_left (fun b t -> b || occurn_pattern n t) (occurn_pattern n b) t || + (occurn_pattern (n+1) c) + | PIf (c,c1,c2) -> + (occurn_pattern n c) || + (occurn_pattern n c1) || (occurn_pattern n c2) + | PCase(_,p,c,br) -> + (occurn_pattern n p) || + (occurn_pattern n c) || + (List.exists (fun (_,_,p) -> occurn_pattern n p) br) + | PMeta _ | PSoApp _ -> true + | PEvar (_,args) -> Array.exists (occurn_pattern n) args + | PVar _ | PRef _ | PSort _ -> false + | PFix fix -> not (noccurn n (mkFix fix)) + | PCoFix cofix -> not (noccurn n (mkCoFix cofix)) + +let noccurn_pattern n c = not (occurn_pattern n c) + exception BoundPattern;; let rec head_pattern_bound t = diff --git a/pretyping/patternops.mli b/pretyping/patternops.mli index ffe0186af..2d1ce1dbc 100644 --- a/pretyping/patternops.mli +++ b/pretyping/patternops.mli @@ -22,6 +22,8 @@ val occur_meta_pattern : constr_pattern -> bool val subst_pattern : substitution -> constr_pattern -> constr_pattern +val noccurn_pattern : int -> constr_pattern -> bool + exception BoundPattern (** [head_pattern_bound t] extracts the head variable/constant of the |