syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // is initialized, and so this read would no longer be needed.
context_before:             // NOTE: If we require never patterns for empty matches, those will check that the place
context_after:             let cause_matched_place = FakeReadCause::ForMatchedPlace(None);