syntax_data: {"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"CliCrateAttr(_)"}]}
source_snippet:             CliCrateAttr(_) => write!(fmt, "<crate attribute>"),
context_before:             ProcMacroSourceCode(_) => write!(fmt, "<proc-macro source code>"),
context_after:             Custom(ref s) => write!(fmt, "<{s}>"),