(1)A court may, on its own motion or on the application of the prosecution or the defence, at the close of the case for the defence, or at the end of any proceeding under this Code, summon a person as a witness or examine a person in attendance as a witness, whether or not summoned, or recall and re-examine a person already examined.

(2)The court must summon and examine or recall and re-examine²⁰²¹re‑examine²⁰²¹ such a person if it thinks his²⁰²¹the person’s²⁰²¹ evidence is essential to making a just decision in the case.

(3)The exercise by a court of its power under subsection (1) is not a ground for appeal, or for revision, unless the appellant,²⁰²¹appellant²⁰²¹ or the applicant,²⁰²¹applicant²⁰²¹ as²⁰²¹(as²⁰²¹ the case may be,²⁰²¹be)²⁰²¹ shows that the examination has led to a failure of justice.