syntax_data: {"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"unpack!(block"}]}
source_snippet:                     unpack!(block = this.as_temp(block, expr.temp_lifetime, expr_id, mutability));
context_before:                 let temp =
context_after:                 block.and(PlaceBuilder::from(temp))