syntax_data: {"ast_node_type":"variable","tokens":[{"end":56,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let block = self.mirror_block(body);
context_before:                         .temporary_scope(self.region_scope_tree, body.hir_id.local_id);
context_after:                     let body = self.thir.exprs.push(Expr {