syntax_data: {"ast_node_type":"other","tokens":[{"end":32,"kind":"keyword","start":0,"text":"#[cfg(debug_assertions)]"}]}
source_snippet:         #[cfg(debug_assertions)]
context_before:     pub(super) fn seek_to_block_entry(&mut self, block: BasicBlock) {
context_after:         assert!(self.reachable_blocks.contains(block));