syntax_data: {"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // directly to `last_otherwise`. If there is a guard,
context_before:             // R | S)` will fail too. If there is no guard, we skip testing of `Q` by branching
context_after:             // `leaf_candidate.otherwise_block` can be reached by guard failure as well, so we