Nothing
# ------------------------------------------------------------------------------
# dollar
foo$bar
foo$bar$baz
foo$bar@baz
foo$bar()
foo$"bar"
foo$bar()$baz[[1]]$bam
# ------------------------------------------------------------------------------
# dollar no rhs
foo$
# ------------------------------------------------------------------------------
# slot
foo@bar
foo@bar$baz
foo@bar()
foo@"bar"
# ------------------------------------------------------------------------------
# slot no rhs
foo@
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