Commit a807e559 authored by POTTIER Francois's avatar POTTIER Francois

In [KitSubst], implement [visit_'fn] as the identity,

so that substitution succeeds even if there are names
of type ['fn] which the substitution does not rewrite.
parent 7751f604
......@@ -19,10 +19,14 @@ let extend x env =
class ['self] map = object (_ : 'self)
method private extend = extend
(* [visit_'fn] is not implemented, as it is up to the user to identify
variable nodes and replace them. This requires overriding a suitable
visitor method. *)
method private visit_'fn _env _x = assert false
(* [visit_'fn] must be implemented. There could be several kinds of
nodes that carry variables of type ['fn], say, [FooVar] and [BarVar],
and the user may decide to substitute away [FooVar] nodes, but leave
[BarVar] nodes untouched. Another reason is, in an encoding of ML
disjunction patterns where a bound name can appear several times,
things may be set up so that [visit_'bn] is called at the first
occurrence and [visit_'fn] is called at subsequent occurrences. *)
method private visit_'fn _env x = x
let apply (copy : 'thing -> 'thing)
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