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<'tcx> fmt::Debug for TraitRefPrintSugared<'tcx> {
context_after:         fmt::Display::fmt(self, f)