syntax_data: {"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// or not (for `let` and `match`). In the refutable case we return the block to which we branch
context_before:     /// `refutable` indicates whether the candidate list is refutable (for `if let` and `let else`)
context_after:     /// on failure.