[Docs] Fix fold explanation in the guide #18139
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The explanation of fold talks about three elements that should be summed, but it uses different values in the provided code.
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Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @brson (or someone else) soon. |
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this is a nice catch, thank you! |
bors
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The explanation of fold talks about three elements that should be summed, but it uses different values in the provided code.
lnicola
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Sep 25, 2024
fix: Extend `type_variable_table` when modifying index is larger than the table size Fixes rust-lang#18109 Whenever we create an inference variable in r-a, we extend `type_variable_table` to matching size here; https://github.com/rust-lang/rust-analyzer/blob/f4aca78c92e03354327c8f6c7fefaef9f45ab166/crates/hir-ty/src/infer/unify.rs#L378-L381 But sometimes, an inference variable is [created from chalk](https://github.com/rust-lang/chalk/blob/ab710e0c9b455403b138ef72a2fb90967a58eff3/chalk-solve/src/infer/unify.rs#L743) and passed to r-a as a type of an expression or a pattern. If r-a set diverging flag to this before the table is extended to a sufficient size, it panics here; https://github.com/rust-lang/rust-analyzer/blob/f4aca78c92e03354327c8f6c7fefaef9f45ab166/crates/hir-ty/src/infer/unify.rs#L275-L277 I think that extending table when setting diverging flag is reasonable becase we are already doing such extending to a size that covers the inference vars created from chalk and this change only covers the order-dependent random cases that this might fail
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The explanation of fold talks about three elements that should be summed, but it uses different values in the provided code.