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It's saying "the lifetime 'this that is given to this GAT must be a shorter lifetime than Self's". We have to have this to enable implementations of LendingIterator to use types like &'this mut Self in their implementation of Item, since without it that would not be allowed (as there's nothing stopping users from setting 'this to 'static, creating a &'static mut Self which often is an invalid type). You can read more about it in this issue.
funny indeed. i changed all my projects to use tinyvec
The unfortunate asterisk to this is my work on the Storage api; with that abstraction Vec itself could be the small vector type rather than duplicating the entire API onto a second type.
But there's no law of nature that says that Rust type-level syntax must suck forever. Maybe Rust 2036 will make writing this stuff a breeze, who knows. But for now, there are some projects that attempt to fill this gap, like Tyrade, which is a Rust DSL (like, a proc macro) that compiles down to bare Rust. It has seen some usage: there's a session types library built on top of Tyrade that is just awesome:
But there's no law of nature that says that Rust type-level syntax must suck forever. Maybe Rust 2036 will make writing this stuff a breeze, who knows. But for now, there are some projects that attempt to fill this gap, like Tyrade, which is a Rust DSL (like, a proc macro) that compiles down to bare Rust. It has seen some usage: there's a session types library built on top of Tyrade that is just awesome: