diff --git a/bootstrap/pkg/ast/source.go b/bootstrap/pkg/ast/source.go
index 1b72be4..cef2b98 100644
--- a/bootstrap/pkg/ast/source.go
+++ b/bootstrap/pkg/ast/source.go
@@ -27,6 +27,7 @@ import (
 )
 
 var builtinSource *Source
+var OutOfRangeLine string = "----"
 
 type Source struct {
 	// A Pointer to the buffer where the parser used for parsing the source
@@ -59,7 +60,7 @@ func (s *Source) GetLine(linenum int) string {
 	if linenum > 0 && linenum <= len(lines) {
 		return lines[linenum-1]
 	}
-	return "----"
+	return OutOfRangeLine
 }
 
 // LineNumberFor returns the line number associated with the given position `pos` in
diff --git a/bootstrap/pkg/core/core.go b/bootstrap/pkg/core/core.go
index de714ea..76fefba 100644
--- a/bootstrap/pkg/core/core.go
+++ b/bootstrap/pkg/core/core.go
@@ -78,10 +78,11 @@ func REPL(flags map[string]bool) {
 		EOFPrompt:         "exit",
 		HistorySearchFold: true,
 	})
+
 	if err != nil {
 		panic(err)
-
 	}
+
 	rl.HistoryEnable()
 	defer rl.Close()
 
@@ -108,7 +109,6 @@ for details take a look at the LICENSE file.
 		}
 		rep(rt, line)
 	}
-
 }
 
 func Run(flags map[string]bool, args []string) {
@@ -121,7 +121,6 @@ func Run(flags map[string]bool, args []string) {
 	rt.CreateNS("serene.internal", "RUN", true)
 
 	if len(args) == 0 {
-
 		PrintError(rt, MakePlainError("'run' command needs at least one argument"))
 		os.Exit(1)
 	}
diff --git a/bootstrap/pkg/core/printer.go b/bootstrap/pkg/core/printer.go
index da45078..bdd1320 100644
--- a/bootstrap/pkg/core/printer.go
+++ b/bootstrap/pkg/core/printer.go
@@ -23,6 +23,7 @@ import (
 	"strings"
 
 	"github.com/gookit/color"
+	"serene-lang.org/bootstrap/pkg/ast"
 	"serene-lang.org/bootstrap/pkg/errors"
 )
 
@@ -149,7 +150,7 @@ func frameSource(traces *TraceBack, frameIndex int) string {
 
 		if fLoc.IsKnownLocaiton() {
 			line := fLoc.GetSource().GetLine(i)
-			if line != "----" {
+			if line != ast.OutOfRangeLine {
 				lines += fmt.Sprintf("%d:\t%s\n", i, line)
 			}
 		} else {