syntax_data: {"ast_node_type":"other","tokens":[{"end":41,"kind":"keyword","start":0,"text":"*block.terminator_mut()"}]}
source_snippet:                 *block.terminator_mut() =
context_before:             if idx != poison_block {
context_after:                     Terminator { source_info, kind: TerminatorKind::Goto { target: poison_block } };