syntax_data: {"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"block_data.statements.split_off(location.statement_index),"}]}
source_snippet:         block_data.statements.split_off(location.statement_index),
context_before:     let new_block = BasicBlockData::new_stmts(
context_after:         block_data.terminator.take(),