diff options
Diffstat (limited to 'kernel/typeops.ml')
| -rw-r--r-- | kernel/typeops.ml | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/kernel/typeops.ml b/kernel/typeops.ml index 255e8d7aa5..46dd750781 100644 --- a/kernel/typeops.ml +++ b/kernel/typeops.ml @@ -954,3 +954,19 @@ let control_only_guard env sigma = | DLAMV(_,v) -> Array.iter control_rec v in control_rec + +(* [keep_hyps sign ids] keeps the part of the signature [sign] which + contains the variables of the set [ids], and recursively the variables + contained in the types of the needed variables. *) + +let keep_hyps sign needed = + rev_sign + (fst (it_sign + (fun ((hyps,globs) as sofar) id a -> + if Idset.mem id globs then + (add_sign (id,a) hyps, + Idset.union (global_vars_set a.body) globs) + else + sofar) + (nil_sign,needed) sign)) + |