syntax_data: {"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"Error(_)"}]}
source_snippet:             Error(_) => write!(f, "{{const error}}"),
context_before:             Value(val) => write!(f, "{val:?}"),
context_after:             Expr(expr) => write!(f, "{expr:?}"),