syntax_data: {"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"\"show"}]}
source_snippet:          "show backtraces for panics during proc-macro execution (default: no)"),
context_before:     proc_macro_backtrace: bool = (false, parse_bool, [UNTRACKED],
context_after:     proc_macro_execution_strategy: ProcMacroExecutionStrategy = (ProcMacroExecutionStrategy::SameThread,