diff options
Diffstat (limited to 'pretyping')
| -rw-r--r-- | pretyping/evarsolve.ml | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/pretyping/evarsolve.ml b/pretyping/evarsolve.ml index f5d8baed9..078117fbd 100644 --- a/pretyping/evarsolve.ml +++ b/pretyping/evarsolve.ml @@ -1104,7 +1104,14 @@ let solve_evar_evar_l2r f g env evd aliases pbty ev1 (evk2,_ as ev2) = let opp_problem = function None -> None | Some b -> Some (not b) -let preferred_orientation evd evk1 evk2 = false +let preferred_orientation evd evk1 evk2 = + let _,src1 = (Evd.find_undefined evd evk1).evar_source in + let _,src2 = (Evd.find_undefined evd evk2).evar_source in + (* This is a heuristic useful for program to work *) + match src1,src2 with + | Evar_kinds.QuestionMark _, _ -> true + | _,Evar_kinds.QuestionMark _ -> false + | _ -> true let solve_evar_evar_aux f g env evd pbty (evk1,args1 as ev1) (evk2,args2 as ev2) = let aliases = make_alias_map env in |