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%prep

  mkdir whence.tmp
  ln -s . whence.tmp/cwd
  # cd through the symlink in order to test the case that ${prefix} and
  # ${prefix:P} are different
  pushd whence.tmp/cwd
  ln -s real step3
  ln -s step3 step2
  ln -s step2 step1
  ln -s loop loop
  ln -s flip flop
  ln -s flop flip
  touch real
  chmod +x real
  prefix=$PWD
  popd

%test

  (
    path=( ${PWD:P}/whence.tmp $path )
    whence -S step1
    whence -s step1
  )
0q:whence symlink resolution
>${prefix:P}/step1 -> ${prefix:P}/step2 -> ${prefix:P}/step3 -> ${prefix:P}/real
>${prefix:P}/step1 -> ${prefix:P}/real

  (
    path=( $PWD/whence.tmp $path )
    whence -S flip || whence -S loop || whence -s flip || whence -s loop
  )
1:whence deals with symlink loops gracefully