\version "2.21.0"

\header {
  texidoc = "
@code{\\laissezVibrer} and @code{\\repeatTie} ties should also work on 
individual notes of a chord.
They can be parenthesized and their directions may be forced.
" }

testSemiTies = 
#(define-music-function (m)(ly:event?)
#{
  \new Staff { 
    \time 7/8 
    cis'2.. $m <cis' $m gis'> <cis' gis' $m > <cis' gis'> $m 
  }
#})

to = g

\transpose c \to
<<
  \testSemiTies \repeatTie
  \testSemiTies \parenthesize \repeatTie
  \testSemiTies \parenthesize ^\repeatTie
  \testSemiTies \parenthesize _\repeatTie
>>

\transpose c \to
<<
  \testSemiTies \laissezVibrer
  \testSemiTies \parenthesize \laissezVibrer
  \testSemiTies \parenthesize ^\laissezVibrer
  \testSemiTies \parenthesize _\laissezVibrer
>>