syntax_data: {"ast_node_type":"other","tokens":[{"end":91,"kind":"keyword","start":0,"text":"unpack!(body_block"}]}
source_snippet:                         unpack!(body_block = this.as_place_builder(body_block, scrutinee));
context_before:                     let scrutinee_place_builder =
context_after:                     let scrutinee_span = this.thir.exprs[scrutinee].span;