From 954fbd3b102060ed1e2122f571a430f05a174e42 Mon Sep 17 00:00:00 2001 From: Maxime Dénès Date: Tue, 9 May 2017 22:14:35 +0200 Subject: Remove the Sigma (monotonous state) API. Reminder of (some of) the reasons for removal: - Despite the claim in sigma.mli, it does *not* prevent evar leaks, something like: fun env evd -> let (evd',ev) = new_evar env evd in (evd,ev) will typecheck even with Sigma-like type annotations (with a proof of reflexivity) - The API stayed embryonic. Even typing functions were not ported to Sigma. - Some unsafe combinators (Unsafe.tclEVARS) were replaced with slightly less unsafe ones (e.g. s_enter), but those ones were not marked unsafe at all (despite still being so). - There was no good story for higher order functions manipulating evar maps. Without higher order, one can most of the time get away with reusing the same name for the updated evar map. - Most of the code doing complex things with evar maps was using unsafe casts to sigma. This code should be fixed, but this is an orthogonal issue. Of course, this was showing a nice and elegant use of GADTs, but the cost/benefit ratio in practice did not seem good. --- engine/eConstr.ml | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) (limited to 'engine/eConstr.ml') diff --git a/engine/eConstr.ml b/engine/eConstr.ml index 33d7acc31..078f2fc33 100644 --- a/engine/eConstr.ml +++ b/engine/eConstr.ml @@ -780,9 +780,8 @@ let lookup_named n e = cast_named_decl (sym unsafe_eq) (lookup_named n e) let lookup_named_val n e = cast_named_decl (sym unsafe_eq) (lookup_named_val n e) let fresh_global ?loc ?rigid ?names env sigma reference = - let Sigma.Sigma (t,sigma,p) = - Sigma.fresh_global ?loc ?rigid ?names env sigma reference in - Sigma.Sigma (of_constr t,sigma,p) + let (evd,t) = Evd.fresh_global ?loc ?rigid ?names env sigma reference in + evd, of_constr t let is_global sigma gr c = Globnames.is_global gr (to_constr sigma c) -- cgit v1.2.3