config/lang; missed file

config/lang.go

@@ -0,0 +1,11 @@
+package config
+
+import (
+	"github.com/hashicorp/terraform/config/lang/ast"
+)
+
+type noopNode struct{}
+
+func (n *noopNode) Accept(ast.Visitor) ast.Node      { return n }
+func (n *noopNode) Pos() ast.Pos                     { return ast.Pos{} }
+func (n *noopNode) Type(ast.Scope) (ast.Type, error) { return ast.TypeString, nil }