pub fn get_variable(
backend: &AnyBackend,
documents: &DashSet<Document, FxBuildHasher>,
current: &[LeafUri],
uri: &DocumentElementUri,
prepare: impl Fn(Term) -> Term,
) -> Result<SharedDocumentElement<VariableDeclaration>, ()>pub fn get_variable(
backend: &AnyBackend,
documents: &DashSet<Document, FxBuildHasher>,
current: &[LeafUri],
uri: &DocumentElementUri,
prepare: impl Fn(Term) -> Term,
) -> Result<SharedDocumentElement<VariableDeclaration>, ()>