$nota ^\markup {M} version 2.19 vs 2.21

[Gianmaria Lari]

This code works.

\version "2.21.0"
test = #(define-scheme-function (nota) (ly:music?)
  #{
     $nota ^\markup {M}
  #})

{\test c}

but it didn't in version 2.19.83. How I should modify it to make it working
in 2.19.83?
Thank you, g.