This avoids a -pedantic warning: warning: ISO C++11 requires at least one argument for the "..." in a variadic macro See also https://github.com/google/googletest/issues/2271
HashBuilder
The `HashBuilder` interface allows conveniently building hashes of various data types, without relying on the underlying hasher type to know about hashed data types. Reviewed By: dexonsmith Differential Revision: https://reviews.llvm.org/D106910