syntax_data: {"ast_node_type":"variable","tokens":[{"end":94,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let Block { region_scope, span, ref stmts, expr, targeted_by_break, safety_mode: _ } =
context_before:     ) -> BlockAnd<()> {
context_after:             self.thir[ast_block];