syntax_data: {"ast_node_type":"variable","tokens":[{"end":78,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let rvalue = Rvalue::Use(this.consume_by_copy_or_move(place));
context_before:                 let place = unpack!(block = this.as_place(block, expr_id));
context_after:                 this.cfg.push_assign(block, source_info, destination, rvalue);