diff options
| author |  gareuselesinge <gareuselesinge@85f007b7-540e-0410-9357-904b9bb8a0f7> | 2011-11-08 15:23:51 +0000 |
|---|---|---|
| committer | gareuselesinge <gareuselesinge@85f007b7-540e-0410-9357-904b9bb8a0f7> | 2011-11-08 15:23:51 +0000 |
| commit | a0054d400f733bc1761cc1c07ff75b17f94c36f1 (patch) | |
| tree | fdec1de4267513fe9005f2b666dc39ed3dda1320 /pretyping/unification.ml | |
| parent | 6413ff1c4dd4b67d53fb15f82ca3dc0e129b7e38 (diff) | |
Improved check is_open_canonical_projection
The check looks for 1 canonical projection applied to a meta/evar.
This fails to deal with telescopes that generate unification problems
containing something like "(pi_1 (pi_2 ?))" that is indeed a "stuck"
canonical projection but not of the form recognized by the previous
implementation. The same holds when pi_2 is a general function not
producing a constructor.
This patch checks if the argument of the canonical projection weak head
reduces to a constructor calling whd_betadeltaiota.
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@14645 85f007b7-540e-0410-9357-904b9bb8a0f7
Diffstat (limited to 'pretyping/unification.ml')
| -rw-r--r-- | pretyping/unification.ml | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/pretyping/unification.ml b/pretyping/unification.ml index 6fff81cfe..693ea4395 100644 --- a/pretyping/unification.ml +++ b/pretyping/unification.ml @@ -560,7 +560,7 @@ let unify_0_with_initial_metas (sigma,ms,es as subst) conv_at_top env cv_pb flag let f1 () = if isApp cM then let f1l1 = decompose_app cM in - if is_open_canonical_projection sigma f1l1 then + if is_open_canonical_projection env sigma f1l1 then let f2l2 = decompose_app cN in solve_canonical_projection curenvnb pb b cM f1l1 cN f2l2 substn else error_cannot_unify (fst curenvnb) sigma (cM,cN) @@ -573,7 +573,7 @@ let unify_0_with_initial_metas (sigma,ms,es as subst) conv_at_top env cv_pb flag try f1 () with e when precatchable_exception e -> if isApp cN then let f2l2 = decompose_app cN in - if is_open_canonical_projection sigma f2l2 then + if is_open_canonical_projection env sigma f2l2 then let f1l1 = decompose_app cM in solve_canonical_projection curenvnb pb b cN f2l2 cM f1l1 substn else error_cannot_unify (fst curenvnb) sigma (cM,cN) |