Save AST in compiled program (#268)

Author: antonmedv

compiler/compiler.go

@@ -44,6 +44,7 @@ func Compile(tree *parser.Tree, config *conf.Config) (program *Program, err erro
 	}
 
 	program = &Program{
+		Node:      tree.Node,
 		Source:    tree.Source,
 		Locations: c.locations,
 		Constants: c.constants,

vm/program.go

@@ -4,11 +4,13 @@ import (
 	"fmt"
 	"regexp"
 
+	"github.com/antonmedv/expr/ast"
 	"github.com/antonmedv/expr/file"
 	"github.com/antonmedv/expr/vm/runtime"
 )
 
 type Program struct {
+	Node      ast.Node
 	Source    *file.Source
 	Locations []file.Location
 	Constants []interface{}