syntax_data: {"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"write!(self,"}]}
source_snippet:                     write!(self, "{size}")?
context_before:                 if let Some(size) = size.try_to_target_usize(self.tcx()) {
context_after:                 } else if let ty::ConstKind::Param(param) = size.kind() {