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2010-04-13 * Use std::tr1::unordered_set instead of std::set for the symbolEelco Dolstra1-1/+7
table. This gives a 10% speed increase on `nix-instantiate /etc/nixos/nixos -A system --readonly-mode'.
2010-04-13 * Use a symbol table to represent identifiers and attribute namesEelco Dolstra1-0/+75
efficiently. The symbol table ensures that there is only one copy of each symbol, thus allowing symbols to be compared efficiently using a pointer equality test.