syntax_data: {"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"write!(self,"}]}
source_snippet:             write!(self, "ValTree({:?}: ", cv.valtree)?;
context_before:         if with_reduced_queries() || self.should_print_verbose() {
context_after:             cv.ty.print(self)?;