syntax_data: {"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"self.build_exit_tree(if_then_scope.else_drops,"}]}
source_snippet:             self.build_exit_tree(if_then_scope.else_drops, region_scope, span, None).map_or_else(
context_before:         let else_block =
context_after:                 || self.cfg.start_new_block(),