From eba06e2192d88af463fb6dec85e2f039a0a13694 Mon Sep 17 00:00:00 2001
From: Yves Bertot
Date: Fri, 4 May 2018 15:03:49 +0200
Subject: finished type-checking examples

---
 tuto1/src/simple_check.ml | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

(limited to 'tuto1/src/simple_check.ml')

diff --git a/tuto1/src/simple_check.ml b/tuto1/src/simple_check.ml
index 05be6632a0..e949e08a7c 100644
--- a/tuto1/src/simple_check.ml
+++ b/tuto1/src/simple_check.ml
@@ -1,9 +1,32 @@
-let simple_check value_with_constraints =
+let simple_check1 value_with_constraints =
   begin
     let evalue, st = value_with_constraints in
     let evd = Evd.from_ctx st in
+(* This is reverse engineered from vernacentries.ml *)
+(* The point of renaming is to make sure the bound names printed by Check
+   can be re-used in `apply with` tactics that use bound names to
+   refer to arguments. *)
     let j = Termops.on_judgment EConstr.of_constr
       (Arguments_renaming.rename_typing (Global.env())
          (EConstr.to_constr evd evalue)) in
     let {Environ.uj_type=x}=j in x
-  end
\ No newline at end of file
+  end
+
+let simple_check2 value_with_constraints =
+  let evalue, st = value_with_constraints in
+  let evd = Evd.from_ctx st in
+(* This version should be preferred if bound variable names are not so
+  important, you want to really verify that the input is well-typed,
+  and if you want to obtain the type. *)
+(* Note that the output value is a pair containing a new evar_map:
+   typing will fill out blanks in the term by add evar bindings. *)
+  Typing.type_of (Global.env()) evd evalue
+
+let simple_check3 value_with_constraints =
+  let evalue, st = value_with_constraints in
+  let evd = Evd.from_ctx st in
+(* This version should be preferred if bound variable names are not so
+  important and you already expect the input to have been type-checked
+  before.  Set ~lax to false if you want an anomaly to be raised in
+  case of a type error.  Otherwise a ReTypeError exception is raised. *)
+  Retyping.get_type_of ~lax:true (Global.env()) evd evalue
\ No newline at end of file
-- 
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