parser: `Visitor::visit` does not accepts `null`

[nit.git] / src / parser / parser_nodes.nit

diff --git a/src/parser/parser_nodes.nit b/src/parser/parser_nodes.nit
index 0af05c6..9625050 100644 (file)
--- a/src/parser/parser_nodes.nit
+++ b/src/parser/parser_nodes.nit
@@ -103,13 +103,14 @@ abstract class Visitor
        # What the visitor do when a node is visited
        # Concrete visitors should implement this method.
        # @toimplement
-       protected fun visit(e: nullable ANode) is abstract
+       protected fun visit(e: ANode) is abstract
 
        # Ask the visitor to visit a given node.
        # Usually automatically called by visit_all* methods.
        # This method should not be redefined
        fun enter_visit(e: nullable ANode)
        do
+               if e == null then return
                var old = _current_node
                _current_node = e
                visit(e)