syntax_data: {"ast_node_type":"variable","tokens":[{"end":41,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let constant = match &expr.kind {
context_before:         let expr = &self.thir[value];
context_after:             ExprKind::Adt(box AdtExpr { variant_index, fields, base, .. }) => {