syntax_data: {"ast_node_type":"variable","tokens":[{"end":92,"kind":"keyword","start":0,"text":"_"}]}
source_snippet:                 _ if let Some(tail_info) = this.block_context.currently_in_block_tail() => {
context_before:                 // tail expression of a block whose result is ignored.
context_after:                     LocalInfo::BlockTailTemp(tail_info)