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When referring to an associated type of a super trait, we used the substs of the
subtrait. That led to the #4931 crash if the subtrait had less parameters, but
it could also lead to other incorrectness if just the order was different.
Fixes #4931.
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Fixes #4953.
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They should not be applied in expression or pattern contexts, unless there are
other explicitly given type args.
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This is working, but I'm not that happy with how the lowering works. We might
need an additional representation between `TypeRef` and `Ty` where names are
resolved and `impl Trait` bounds are separated out, but things like inference
variables don't exist and `impl Trait` is always represented the same
way.
Also note that this doesn't implement correct handling of RPIT *inside* the
function (which involves turning the `impl Trait`s into variables and creating
obligations for them). That intermediate representation might help there as
well.
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4653: Fix match ergonomics in closure parameters r=matklad a=flodiebold
Fixes #4476.
Co-authored-by: Florian Diebold <[email protected]>
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Fixes #4476.
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4651: Use first match branch in case of type mismatch, not last r=kjeremy a=flodiebold
The comment says this was intentional, but I do agree with #4304 that it makes
more sense the other way around (for if/else as well).
Fixes #4304.
Co-authored-by: Florian Diebold <[email protected]>
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The comment says this was intentional, but I do agree with #4304 that it makes
more sense the other way around (for if/else as well).
Fixes #4304.
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4652: Upgrade Chalk r=kjeremy a=flodiebold
Fixes #4072.
Co-authored-by: Florian Diebold <[email protected]>
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Fixes #4072.
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Function pointers can be 'higher-ranked' over lifetimes, which is why they're
not an application type in Chalk, but since we don't model lifetimes it doesn't
matter for us yet.
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4497: Create LowerCtx on the fly r=matklad a=edwin0cheng
Previously we create `LowerCtx` at the beginning of lowering, however, the hygiene content is in fact changing between macro expression expanding.
This PR change it to create the `LowerCtx` on the fly to fix above bug.
However, #4465 is not fixed by this PR, the goto-def is still not work yet. It only fixed the infer part.
Co-authored-by: Edwin Cheng <[email protected]>
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This also removes some vestiges of the old impl trait support which I think
aren't currently in use.
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I.e.
- `Self(x)` or `Self` in tuple/unit struct impls
- `Self::Variant(x)` or `Self::Variant` in enum impls
- the same in patterns
Fixes #4454.
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This fixes an issue where the following code sample would fail to infer
the type contained in the option:
```rust
fn main() {
let mut end = None; // TODO: Fix inference for this in RA
loop {
end = Some(true);
}
}
```
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4175: Introduce HirDisplay method for rendering source code & use it in add_function assist r=flodiebold a=TimoFreiberg
Next feature for #3639.
So far the only change in the new `HirDisplay` method is that paths are qualified, but more changes will be necessary (omitting the function name from function types, returning an error instead of printing `"{unknown}"`, probably more).
Is that approach okay?
Co-authored-by: Timo Freiberg <[email protected]>
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E.g. in
```rust
match x {
1 => function1,
2 => function2,
}
```
we need to try coercing both to pointers. Turns out this is a special case in
rustc as well (see the link in the comment).
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Still no break-with-value or labels, but at least we know that `loop { break; }`
doesn't diverge.
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Divergence here means that for some reason, the end of a block will not be
reached. We tried to model this just using the never type, but that doesn't work
fully (e.g. in `let x = { loop {}; "foo" };` x should still have type `&str`);
so this introduces a `diverges` flag that the type checker keeps track of, like
rustc does.
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They're `&[u8; N]`, not `&[u8]` (see #4374).
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4305: Favor types for record type struct in name resolution r=matklad a=edwin0cheng
Fixed #4235
Co-authored-by: Edwin Cheng <[email protected]>
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4234: Support local_inner_macros r=jonas-schievink a=edwin0cheng
This PR implements `#[macro_export(local_inner_macros)]` support.
Note that the rustc implementation is quite [hacky][1] too. :)
[1]: https://github.com/rust-lang/rust/blob/614f273e9388ddd7804d5cbc80b8865068a3744e/src/librustc_resolve/macros.rs#L456
Co-authored-by: Edwin Cheng <[email protected]>
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4173: Use core instead of std for builtin derive macros r=edwin0cheng a=edwin0cheng
Fixed #4087.
We can't use `$crate` here right now because :
1. We have to able to detect `macro` 2.0 in collecting phase for finding `rustc_builtin_macro` attrs.
2. And we have to make hygiene works for builtin derive macro.
r= @flodiebold
Co-authored-by: Edwin Cheng <[email protected]>
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So e.g. if we have `fn foo<T: SomeTrait<u32>>() -> T::Item`, we want to lower
that to `<T as SomeTrait<u32>>::Item` and not `<T as SomeTrait<_>>::Item`.
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We need to shift in when we're substituting inside a binder.
This should fix #4053 (it doesn't fix the occasional overflow that also occurs
on the Diesel codebase though).
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The root cause was that we forgot to add bindings from the arm to the
guard expression
closes #3980
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