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2020-05-21 r/797 refactor(3p/nix/libexpr): Use std::string as qualified typeVincent Ambo1-1/+1
Replaces most uses of `string` with `std::string`. This came up because I removed the "types.hh" import from "symbol-table.hh", which percolated through a bunch of files where `string` was suddenly no longer defined ... *sigh*
2020-05-21 r/794 refactor(3p/nix/libexpr): Use absl::node_hash_set in SymbolTableVincent Ambo1-0/+24
This replaces the previous use of std::unordered_set with absl::node_hash_set. This type was chosen because the current implementation requires pointer stability. This does not yet touch the 'Attr' struct. As a bonus, the implementation of the SymbolTable struct is now consolidated into a single header/implementation file pair.