syntax_data: {"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if self.state_needs_reset || self.pos.block != target.block {
context_before:         //   - We are in the same block but have advanced past the target effect.
context_after:             self.seek_to_block_entry(target.block);