From 03bb8c6a22fea0214179e6d5a9d97327d548d2fd Mon Sep 17 00:00:00 2001
From: Enrico Tassi
Date: Tue, 21 Aug 2018 13:08:22 +0200
Subject: [ssr] guard all `try pf_unify_HO` with CErrors.noncritical

---
 plugins/ssr/ssrelim.ml     | 6 ++++--
 plugins/ssr/ssrequality.ml | 3 ++-
 2 files changed, 6 insertions(+), 3 deletions(-)

(limited to 'plugins')

diff --git a/plugins/ssr/ssrelim.ml b/plugins/ssr/ssrelim.ml
index fbe3b000fb..602fcfcab5 100644
--- a/plugins/ssr/ssrelim.ml
+++ b/plugins/ssr/ssrelim.ml
@@ -293,7 +293,8 @@ let ssrelim ?(ind=ref None) ?(is_case=false) deps what ?elim eqid elim_intro_tac
         let c, cl, ucst = match_pat env p occ h cl in
         let gl = pf_merge_uc ucst gl in
         let c = EConstr.of_constr c in
-        let gl = try pf_unify_HO gl inf_t c with _ -> error gl c inf_t in
+        let gl = try pf_unify_HO gl inf_t c
+                 with exn when CErrors.noncritical exn -> error gl c inf_t in
         cl, gl, post
       with 
       | NoMatch | NoProgress ->
@@ -302,7 +303,8 @@ let ssrelim ?(ind=ref None) ?(is_case=false) deps what ?elim eqid elim_intro_tac
           let e = EConstr.of_constr e in
           let n, e, _, _ucst =  pf_abs_evars gl (fst p, e) in
           let e, _, _, gl = pf_saturate ~beta:true gl e n in 
-          let gl = try pf_unify_HO gl inf_t e with _ -> error gl e inf_t in
+          let gl = try pf_unify_HO gl inf_t e
+                   with exn when CErrors.noncritical exn -> error gl e inf_t in
           cl, gl, post
     in        
     let rec match_all concl gl patterns =
diff --git a/plugins/ssr/ssrequality.ml b/plugins/ssr/ssrequality.ml
index 23cbf49c05..f23433f2f4 100644
--- a/plugins/ssr/ssrequality.ml
+++ b/plugins/ssr/ssrequality.ml
@@ -115,7 +115,8 @@ let newssrcongrtac arg ist gl =
   (* utils *)
   let fs gl t = Reductionops.nf_evar (project gl) t in
   let tclMATCH_GOAL (c, gl_c) proj t_ok t_fail gl =
-    match try Some (pf_unify_HO gl_c (pf_concl gl) c) with _ -> None with  
+    match try Some (pf_unify_HO gl_c (pf_concl gl) c)
+          with exn when CErrors.noncritical exn -> None with
     | Some gl_c ->
         tclTHEN (Proofview.V82.of_tactic (convert_concl (fs gl_c c)))
           (t_ok (proj gl_c)) gl
-- 
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