syntax_data: {"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":"Self::set_field(&mut"}]}
source_snippet:                     Self::set_field(&mut ret.formatter, tcx, name, &attr, |s| match s {
context_before:                 Some(name @ sym::borrowck_graphviz_format) => {
context_after:                         sym::two_phase => Ok(s),