syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"for"}]}
source_snippet:         for (i, block_def) in block_defs.iter().enumerate() {
context_before:         );
context_after:             let is_cleanup = self.body.basic_blocks_mut()[BasicBlock::from_usize(i)].is_cleanup;