syntax_data: {"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // R | S)` will fail too. If there is no guard, we skip testing of `Q` by branching
context_before:             // In a case like `(P | Q, R | S)`, if `P` succeeds and `R | S` fails, we know `(Q,
context_after:             // directly to `last_otherwise`. If there is a guard,