syntax_data: {"ast_node_type":"other","tokens":[{"end":45,"kind":"keyword","start":0,"text":"Anon(_)"}]}
source_snippet:             Anon(_) => write!(fmt, "<anon>"),
context_before:             MacroExpansion(_) => write!(fmt, "<macro expansion>"),
context_after:             ProcMacroSourceCode(_) => write!(fmt, "<proc-macro source code>"),