Change io_error abstraction #11957
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Even the docs for read are kind of a mess. |
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You may be interested in #11946, we're switching to |
matthiaskrgr
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Oct 11, 2022
…, r=Veykril
internal: change generic parameter order
tl;dr: This PR changes the `Substitution` for trait items and methods like so:
```rust
trait Trait<TP, const CP: usize> { // note the implicit Self as first parameter
type Type<TC, const CC: usize>;
fn f<TC, const CC: usize>() {}
}
impl<TP, const CP: usize> S {
fn f<TC, const CC: usize>() {}
}
```
- before this PR: `[Self, TP, CP, TC, CC]` for each trait item, `[TP, CP, TC, CC]` for `S::f`
- after this PR: `[TC, CC, Self, TP, CP]` for each trait item, `[TC, CC, TP, CP]` for `S::f`
---
This PR "inverts" the generic parameters/arguments of an item and its parent. This is to fulfill [chalk's expectation](https://github.com/rust-lang/chalk/blob/d875af0ff196dd6430b5f5fd87a640fa5ab59d1e/chalk-solve/src/rust_ir.rs#L498-L502) on the order of generic arguments in `Substitution`s for generic associated types and it's one step forward for GATs support (hopefully). Although chalk doesn't put any constraint for other items, it feels more natural to get everything aligned than special casing GATs.
One complication is that `TyBuilder` now demands its users to pass in parent's `Substitution` upon construction unless it's obvious that the the item has no parent (e.g. an ADT never has parent). All users *should* already know the parent of the item in question, and without this, it cannot be easily reasoned about whether we're pushing the argument for the item or for its parent.
Some additional notes:
- f8f5a5e: This isn't related to the change, but I felt it's nicer.
- 78977cd: There's one major change here other than the generic param order: Default arguments are now bound by the same `Binder` as the item in question rather than a `Binder` limited to parameters they can refer to (i.e. arguments that syntactically appear before them). Now that the order of generic parameters is changed, it would be somewhat complicated to make such `Binder`s as before, and the "full" `Binder`s shouldn't be a problem because we already make sure that the default arguments don't refer to the generic arguments after them with `fallback_bound_vars()`.
- 7556f74: This is split from 4385d3d to make it easy to revert if it turns out that the GATs with const generics panic is actually not resolved with this PR. cc rust-lang#11878 rust-lang#11957
flip1995
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Jan 11, 2024
don't lint [`default_numeric_fallback`] on return and local assigned macro calls with type stated fixes: rust-lang#11535 changelog: don't lint [`default_numeric_fallback`] on return and local assigned macro calls with type stated
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Looking at the example for handling io_errors leaves a bad taste in my mouth. Not that I have any [helpful] suggestions, but can we simplify the APIs around IO and error handling?
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