diff options
| author |  Pierre-Marie Pédrot <pierre-marie.pedrot@inria.fr> | 2018-03-28 13:48:19 +0200 |
|---|---|---|
| committer | Pierre-Marie Pédrot <pierre-marie.pedrot@inria.fr> | 2018-06-04 14:26:28 +0200 |
| commit | dfa7719a3c73c2dd79a444e8b8c5306661005538 (patch) | |
| tree | 8633590bba5aa403f6ab3ce176fb06ccf025c67c /pretyping/pretyping.ml | |
| parent | 82dc05efc11514c2c05ec17e448e0b4b322e7c86 (diff) | |
Stronger invariants in unification signature.
We use an option type instead of returning a pair with a boolean. Indeed, the
boolean being true was always indicating that the returned value was unchanged.
The previous API was somewhat error-prone, and I don't understand why it was
designed this way in the first place.
Diffstat (limited to 'pretyping/pretyping.ml')
| -rw-r--r-- | pretyping/pretyping.ml | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/pretyping/pretyping.ml b/pretyping/pretyping.ml index 92f87ab95..b2507b5f2 100644 --- a/pretyping/pretyping.ml +++ b/pretyping/pretyping.ml @@ -1082,9 +1082,9 @@ let rec pretype k0 resolve_tc (tycon : type_constraint) (env : ExtraEnv.t) evdre let cj = pretype empty_tycon env evdref lvar c in let cty = nf_evar !evdref cj.uj_type and tval = nf_evar !evdref tval in if not (occur_existential !evdref cty || occur_existential !evdref tval) then - let (evd,b) = Reductionops.vm_infer_conv env.ExtraEnv.env !evdref cty tval in - if b then (evdref := evd; cj, tval) - else + match Reductionops.vm_infer_conv env.ExtraEnv.env !evdref cty tval with + | Some evd -> (evdref := evd; cj, tval) + | None -> error_actual_type ?loc env.ExtraEnv.env !evdref cj tval (ConversionFailed (env.ExtraEnv.env,cty,tval)) else user_err ?loc (str "Cannot check cast with vm: " ++ @@ -1093,9 +1093,9 @@ let rec pretype k0 resolve_tc (tycon : type_constraint) (env : ExtraEnv.t) evdre let cj = pretype empty_tycon env evdref lvar c in let cty = nf_evar !evdref cj.uj_type and tval = nf_evar !evdref tval in begin - let (evd,b) = Nativenorm.native_infer_conv env.ExtraEnv.env !evdref cty tval in - if b then (evdref := evd; cj, tval) - else + match Nativenorm.native_infer_conv env.ExtraEnv.env !evdref cty tval with + | Some evd -> (evdref := evd; cj, tval) + | None -> error_actual_type ?loc env.ExtraEnv.env !evdref cj tval (ConversionFailed (env.ExtraEnv.env,cty,tval)) end |