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Auto merge of #42533 - Mark-Simulacrum:macro-parse-speed-small, r=jse…
…yfried Speed up expansion This reduces duplication, thereby increasing expansion speed. Based on tests with rust-uinput, this produces a 29x performance win (440 seconds to 15 seconds). I want to land this first, since it's a minimal patch, but with more changes to the macro parsing I can get down to 12 seconds locally. There is one FIXME added to the code that I'll keep for now since changing it will spread outward and increase the patch size, I think. Fixes #37074. r? @jseyfried cc @oberien
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