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​​Lang Team Type Alias Summary

​​Rust issues and links

• ​​https://github.com/rust-lang/rust/issues/44075

• ​​https://github.com/rust-lang/rust/issues/44075

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​​Various considerations

• ​​unenforced, extra bounds:

• ​​type Foo<T: Hash> = Vec<T>​

• ​​eddyb did an experiment here to report errors for “extra” bounds

• ​​found that Sized​ would want to be singled out, since type Foo<T> = Box<T>​ etc would be common, and should (strictly speaking) be written type Foo<T: ?Sized> = Box<T>​

• ​​too few bounds:

• ​​type Foo<T> = NeedsHash<T>​

• ​​crater report suggested 379 regressions — widespread regressions, in other words

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