syntax_data: {"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                     // (Interestingly this means that exhaustiveness analysis relies, for soundness,
context_before:                     // comparison defined in `core`.
context_after:                     // on the `PartialEq` impl for `str` to b correct!)