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It appears for Swift there was confusing errors when trying to parse APINotes, when libAPINotes and libInterfaceStub are linked, they both export symbol `__ZN4llvm4yaml7yamlizeINS_12VersionTupleEEENSt3__19enable_ifIXsr16has_ScalarTraitsIT_EE5valueEvE4typeERNS0_2IOERS5_bRNS0_12EmptyContextE`, and discovered same symbol defined within llvm-ifs. This consolidates the boilerplate into YAMLTraits and defers the specific validation in reading the whole input. fixes: rdar://problem/70450563 Reviewed By: phosek, dblaikie Differential Revision: https://reviews.llvm.org/D89764