syntax_data: {"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"StmtKind::Let"}]}
source_snippet:             StmtKind::Let { pattern, initializer: Some(initializer), .. } => {
context_before:         match &self.thir[stmt].kind {
context_after:                 let (var, ..) = self.parse_var(pattern)?;