syntax_data: {"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // were testing match branches one by one in order. In the refutable case we also want a
context_before:         // generated. We falsely branch from each candidate to the one below it to make it as if we
context_after:         // false edge to the final failure block.