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040000 tree 39eeb76d6324f4ea8f769eb725376507e746230b	buffercovariantreturntype
040000 tree 3641955b5b9ff9a54c63ba3ca360959eb05c6b20	desugaredlibrary
040000 tree 4d052d0a464e131db949845bbc5c73d2bdf63d21	horizontalclassmerging
040000 tree d482eabae6bdd0864bc967815f0f979e16427e06	nest