syntax_data: {"ast_node_type":"function","tokens":[{"end":72,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
context_before: impl<I: Interner> fmt::Debug for ConstKind<I> {
context_after:         use ConstKind::*;