syntax_data: {"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"StmtKind::Let"}]}
source_snippet:             StmtKind::Let { pattern, .. } => pattern,
context_before:         let pattern = match &self.thir[stmt_id].kind {
context_after:             StmtKind::Expr { expr, .. } => {