syntax_data: {"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"type"}]}
source_snippet:     type Target = FmtPrinterData<'a, 'tcx>;
context_before: impl<'a, 'tcx> Deref for FmtPrinter<'a, 'tcx> {
context_after:     fn deref(&self) -> &Self::Target {