rustc: buffer the output writer for -Z ast-json[-noexpand]. #12999
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This takes the time for `rustc libstd/lib.rs -Z ast-json-noexpand > file.json` from 9.0s to 3.5s (~0.5s spent parsing etc.) and `-Z ast-json` from 11s to 5s (~1.5s spent parsing and expanding).
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Rustup r? `@ghost` changelog: none
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rustc: buffer the output writer for -Z ast-json[-noexpand].
This takes the time for
rustc libstd/lib.rs -Z ast-json-noexpand > file.jsonfrom 9.0s to 3.5s (~0.5s spent parsing etc.) and-Z ast-jsonfrom 11s to 5s (~1.5s spent parsing and expanding).