syntax_data: {"ast_node_type":"function","tokens":[{"end":62,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
context_before: impl<I: Interner, V: fmt::Display> fmt::Display for Canonical<I, V> {
context_after:         let Self { value, max_universe, variables } = self;