This reduces compilation time by removing a dependency on syn and other
dependencies of ouroboros_macros. In addition it saves a lot of unused
codegened methods.
On my laptop (2 core + HT) this reduces compilation time by ~20%. On a
many core system this doesn't help much though as the critical path path
consists of both ttf-parser -> rustybuzz and swash. Further gains will
likely need to be made by reducing compilation time for these crates.
Benchmark 1: cargo build
Time (mean ± σ): 25.150 s ± 0.167 s [User: 84.414 s, System: 7.335 s]
Range (min … max): 24.909 s … 25.444 s 10 runs
Benchmark 1: cargo build
Time (mean ± σ): 19.819 s ± 0.226 s [User: 67.754 s, System: 5.592 s]
Range (min … max): 19.492 s … 20.140 s 10 runs
The code is based on an expansion of the ouroboros macro, cleaned up to
remove all unused methods and inline most functions that are only called
once.
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