syntax_data: {"ast_node_type":"variable","tokens":[{"end":40,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:             let tail_result_is_ignored =
context_before:             let expr = &this.thir[expr_id];
context_after:                 destination_ty.is_unit() || this.block_context.currently_ignores_tail_results();