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Auto merge of #65293 - tmandry:turbo-expander, r=<try>
Optimize `try_expand_impl_trait_type` A lot of time was being spent expanding some large `impl Future` types in fuchsia. This PR takes the number of types being visited in one expansion from >3 billion to about a thousand, and eliminates the compile time regression in #65147 (in fact, compile times are better than they were before). Thanks to @matthewjasper for suggesting this change. Fixes #65147. r? @matthewjasper,@nikomatsakis
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