syntax_data: {"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                     // conduct the test, if necessary
context_before:                 this.in_breakable_scope(Some(loop_block), destination, expr_span, move |this| {
context_after:                     let body_block = this.cfg.start_new_block();