Fix bug #4471: [generalize dependent] permits ill-typed terms in trunk.

This bug was introduced by 37ab45726, because the new apply_type function
was not checking that the new goal was indeed well-typed. We add this check
locally in the generalize dependent tactic.

1 files changed, 2 insertions, 0 deletions

diff --git a/tactics/tactics.ml b/tactics/tactics.ml
index 2d901c2dbc..2fe8e0bc34 100644
--- a/tactics/tactics.ml
+++ b/tactics/tactics.ml
@@ -2807,6 +2807,8 @@ let old_generalize_dep ?(with_let=false) c gl =
   in
   let cl'',evd = generalize_goal gl 0 ((AllOccurrences,c,body),Anonymous)
     (cl',project gl) in
+  (** Check that the generalization is indeed well-typed *)
+  let (evd, _) = Typing.type_of env evd cl'' in
   let args = Context.Named.to_instance to_quantify_rev in
   tclTHENLIST
     [tclEVARS evd;