    \documentclass{article}

    \usepackage{agda}

    \begin{document}

    No indentation should be inserted before \AgdaKeyword{postulate} or
    the last occurrence of \AgdaPrimitiveType{Set}, and the last
    occurrence of \AgdaPrimitiveType{Set} should be aligned with the
    penultimate occurrence of \AgdaPrimitiveType{Set}:
    \begin{code}
      postulate
        A  : Set
        B  : Set →
             Set
    \end{code}

    \end{document}