syntax_data: {"ast_node_type":"other","tokens":[{"end":39,"kind":"keyword","start":0,"text":"write!(self,"}]}
source_snippet:                     write!(self, "&")?;
context_before:                     let cv = ty::Value { valtree: cv.valtree, ty: inner_ty };
context_after:                     self.pretty_print_const_valtree(cv, print_ty)?;