-- Prose outside the guard, never extracted.
--<*demo>
-- A short explanatory comment.
-- Raw expl3 names work in \cs{keys_set:nn}, \cs*{__fixture_function:N},
-- \cs[fixture sort key]{fixture_name:n}, and \cs{already\_escaped:n}.
-- Nested groups work as well: \cs{fixture_{\meta{kind}}:n}.
local demo_value = "demo"
--</demo>
-- More prose outside the guard.