syntax_data: {"ast_node_type":"function","tokens":[{"end":58,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn print(&self, p: &mut P) -> Result<(), PrintError> {
context_before: impl<'tcx, P: Printer<'tcx>> Print<'tcx, P> for ty::Region<'tcx> {
context_after:         p.print_region(*self)