diff options
Diffstat (limited to 'pretyping')
| -rw-r--r-- | pretyping/cases.ml | 21 |
1 files changed, 9 insertions, 12 deletions
diff --git a/pretyping/cases.ml b/pretyping/cases.ml index fe2b0a5a1a..9d461d1aa1 100644 --- a/pretyping/cases.ml +++ b/pretyping/cases.ml @@ -1925,10 +1925,7 @@ let prepare_predicate_from_arsign_tycon env sigma loc tomatchs arsign c = * type and 1 assumption for each term not _syntactically_ in an * inductive type. - * Each matched terms are independently considered dependent or not. - - * A type constraint but no annotation case: we try to specialize the - * tycon to make the predicate if it is not closed. + * Each matched term is independently considered dependent or not. *) let prepare_predicate loc typing_fun env sigma tomatchs arsign tycon pred = @@ -1938,14 +1935,14 @@ let prepare_predicate loc typing_fun env sigma tomatchs arsign tycon pred = | None, Some t when not (noccur_with_meta 0 max_int t) -> (* If the tycon is not closed w.r.t real variables, we try *) (* two different strategies *) - (* First strategy: we abstract the tycon wrt to the dependencies *) - let p1 = + (* First strategy: we build an "inversion" predicate *) + let sigma1,pred1 = build_inversion_problem loc env sigma tomatchs t in + (* Optional second strategy: we abstract the tycon wrt to the dependencies *) + let p2 = prepare_predicate_from_arsign_tycon env sigma loc tomatchs arsign t in - (* Second strategy: we build an "inversion" predicate *) - let sigma2,pred2 = build_inversion_problem loc env sigma tomatchs t in - (match p1 with - | Some (sigma1,pred1) -> [sigma1, pred1; sigma2, pred2] - | None -> [sigma2, pred2]) + (match p2 with + | Some (sigma2,pred2) -> [sigma1, pred1; sigma2, pred2] + | None -> [sigma1, pred1]) | None, _ -> (* No dependent type constraint, or no constraints at all: *) (* we use two strategies *) @@ -1960,7 +1957,7 @@ let prepare_predicate loc typing_fun env sigma tomatchs arsign tycon pred = in (* First strategy: we build an "inversion" predicate *) let sigma1,pred1 = build_inversion_problem loc env sigma tomatchs t in - (* Second strategy: we directly use the evar as a non dependent pred *) + (* Second strategy: we use the evar or tycon as a non dependent pred *) let pred2 = lift (List.length (List.flatten arsign)) t in [sigma1, pred1; sigma, pred2] (* Some type annotation *) |