syntax_data: {"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // tail expression of a block whose result is ignored.
context_before:                 // Find out whether this temp is being created within the
context_after:                 _ if let Some(tail_info) = this.block_context.currently_in_block_tail() => {