syntax_data: {"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// format. If `early_err` was previously called this will panic.
context_before:     /// Swap out the underlying dcx once we acquire the user's preference on error emission
context_after:     pub fn set_error_format(&mut self, output: ErrorOutputType) {