Simplified standard library

src/core/ToNumber.go

@@ -31,7 +31,12 @@ func (f *Function) ToNumber(t token.Token) (int, error) {
 		}
 
 		number, err := strconv.Atoi(digits)
-		return number, err
+
+		if err != nil {
+			return 0, errors.New(err, f.File, t.Position)
+		}
+
+		return number, nil
 
 	case token.Rune:
 		r := t.Bytes(f.File.Bytes)