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