syntax_data: {"ast_node_type":"variable","tokens":[{"end":92,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                             let expr = self.convert_captured_hir_place(expr, place.clone());
context_before:                         .map(|(place, cause, hir_id)| {
context_after:                             (self.thir.exprs.push(expr), *cause, *hir_id)