diff options
Diffstat (limited to 'pretyping')
| -rw-r--r-- | pretyping/evarutil.ml | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/pretyping/evarutil.ml b/pretyping/evarutil.ml index b6e8f9d138..c2ba6d9575 100644 --- a/pretyping/evarutil.ml +++ b/pretyping/evarutil.ml @@ -1506,7 +1506,10 @@ let solve_candidates conv_algo env evd (evk,argsv as ev) rhs = (filter_compatible_candidates conv_algo env evd evi args rhs) l in match l' with | [] -> error_cannot_unify env evd (mkEvar ev, rhs) - | [c,evd] -> Evd.define evk c evd + | [c,evd] -> + (* solve_candidates might have been called recursively in the mean *) + (* time and the evar been solved by the filtering process *) + if Evd.is_undefined evd evk then Evd.define evk c evd else evd | l when List.length l < List.length l' -> let candidates = List.map fst l in restrict_evar evd evk None (Some candidates) |