syntax_data: {"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// Converts a constant to a pattern (if possible).
context_before: impl<'a, 'tcx> PatCtxt<'a, 'tcx> {
context_after:     /// This means aggregate values (like structs and enums) are converted