syntax_data: {"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"node:"}]}
source_snippet:                             node: unpack!(block = this.as_local_call_operand(block, arg)),
context_before:                         .map(|arg| Spanned {
context_after:                             span: this.thir.exprs[arg].span,