Fix debugger tool

Author: antonmedv

ast/print.go

@@ -5,7 +5,7 @@ import (
 	"reflect"
 )
 
-func Print(node Node) string {
+func Dump(node Node) string {
 	return dump(reflect.ValueOf(node), "")
 }
 

cmd/exe/main.go

@@ -8,6 +8,7 @@ import (
 	"github.com/antonmedv/expr/ast"
 	"github.com/antonmedv/expr/checker"
 	"github.com/antonmedv/expr/compiler"
+	"github.com/antonmedv/expr/internal/conf"
 	"github.com/antonmedv/expr/optimizer"
 	"github.com/antonmedv/expr/parser"
 	"github.com/sanity-io/litter"
@@ -82,15 +83,17 @@ func printAst() {
 	tree, err := parser.Parse(input())
 	check(err)
 
-	_, err = checker.Check(tree, nil)
+	_, err = checker.Check(tree, &conf.Config{
+		AllowUndefinedVariables: true,
+	})
 	check(err)
 
 	if opt {
 		optimizer.Optimize(&tree.Node)
 	}
 
 	if !dot {
-		ast.Print(tree.Node)
+		fmt.Println(ast.Dump(tree.Node))
 		return
 	}
 	dotAst(tree.Node)

parser/parser_test.go

@@ -221,7 +221,7 @@ func TestParse(t *testing.T) {
 			m.Regexp = nil
 			actual.Node = m
 		}
-		assert.Equal(t, ast.Print(test.expected), ast.Print(actual.Node), test.input)
+		assert.Equal(t, ast.Dump(test.expected), ast.Dump(actual.Node), test.input)
 	}
 }