syntax_data: {"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":"ty::ConstKind::Expr(expr)"}]}
source_snippet:             ty::ConstKind::Expr(expr) => self.pretty_print_const_expr(expr, print_ty)?,
context_before:             // write out some legible representation of an abstract const?
context_after:             ty::ConstKind::Error(_) => write!(self, "{{const error}}")?,