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-rw-r--r--toplevel/vernac.mli9
1 files changed, 8 insertions, 1 deletions
diff --git a/toplevel/vernac.mli b/toplevel/vernac.mli
index d89e90d0..bcfe9b71 100644
--- a/toplevel/vernac.mli
+++ b/toplevel/vernac.mli
@@ -21,7 +21,14 @@ exception DuringCommandInterp of Util.loc * exn
exception End_of_input
val just_parsing : bool ref
-val eval_expr : Util.loc * Vernacexpr.vernac_expr -> unit
+
+(** [eval_expr] executes one vernacular command. By default the command is
+ considered as non-state-preserving, in which case we add it to the
+ Backtrack stack (triggering a save of a frozen state and the generation
+ of a new state label). An example of state-preserving command is one coming
+ from the query panel of Coqide. *)
+
+val eval_expr : ?preserving:bool -> Util.loc * Vernacexpr.vernac_expr -> unit
val raw_do_vernac : Pcoq.Gram.parsable -> unit
(** Set XML hooks *)