| Age | Commit message (Collapse) | Author | Lines |
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For named arguments used as implicit position arguments, underline both
the opening curly brace and either:
* if there is formatting, the next character (which will either be the
closing curl brace or the `:` denoting the start of formatting args)
* if there is no formatting, the entire arg span (important if there is
whitespace like `{ }`)
This should make it more obvious where the named argument should be.
Additionally, in the lint message, emit the formatting argument names
without a dollar sign to avoid potentially confusion.
Fixes #99907
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Use Parser's `restrictions` instead of `let_expr_allowed`
This also means that the `ALLOW_LET` flag is reset properly for subexpressions, so we can properly deny things like `a && (b && let c = d)`. Also the parser is a tiny bit smaller now.
It doesn't reject _all_ bad `let` expr usages, just a bit more.
cc `@c410-f3r`
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This was accidentally accepted even though it had no effect in
`global_asm!`. The option only makes sense for `asm!` which runs within
a function.
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Remove some uses of `guess_head_span`
That function cuts a span at the first occurrence of `{`. Using `def_span` is almost always more precise.
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Improve `cannot move out of` error message
Closes #99470
r? `@bjorn3`
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Limit symbols exported from proc macros
Only `__rustc_proc_macro_decls_*__` and `rust_metadata_*` need to be
exported for proc macros to work. All other symbols only increase binary
size and have the potential to conflict with symbols from the host
compiler.
Fixes https://github.com/rust-lang/rust/issues/99909
Fixes #59998
cc `@eddyb`
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Currently we skip deriving `PartialEq::ne` for C-like (fieldless) enums
and empty structs, thus reyling on the default `ne`. This behaviour is
unnecessarily conservative, because the `PartialEq` docs say this:
> Implementations must ensure that eq and ne are consistent with each other:
>
> `a != b` if and only if `!(a == b)` (ensured by the default
> implementation).
This means that the default implementation (`!(a == b)`) is always good
enough. So this commit changes things such that `ne` is never derived.
The motivation for this change is that not deriving `ne` reduces compile
times and binary sizes.
Observable behaviour may change if a user has defined a type `A` with an
inconsistent `PartialEq` and then defines a type `B` that contains an
`A` and also derives `PartialEq`. Such code is already buggy and
preserving bug-for-bug compatibility isn't necessary.
Two side-effects of the change:
- There is only one error message produced for types where `PartialEq`
cannot be derived, instead of two.
- For coverage reports, some warnings about generated `ne` methods not
being executed have disappeared.
Both side-effects seem fine, and possibly preferable.
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r=compiler-errors
Add wrap suggestions for record variants
This PR adds a suggestions to wrap an expression in a record struct/variant when encountering mismatched types, similarly to a suggestion to wrap expression in a tuple struct that was added before.
An example:
```rust
struct B {
f: u8,
}
enum E {
A(u32),
B { f: u8 },
}
fn main() {
let _: B = 1;
let _: E = 1;
}
```
```text
error[E0308]: mismatched types
--> ./t.rs:11:16
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11 | let _: B = 1;
| - ^ expected struct `B`, found integer
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| expected due to this
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help: try wrapping the expression in `B`
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11 | let _: B = B { f: 1 };
| ++++++ +
error[E0308]: mismatched types
--> ./t.rs:12:16
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12 | let _: E = 1;
| - ^ expected enum `E`, found integer
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| expected due to this
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help: try wrapping the expression in a variant of `E`
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12 | let _: E = E::A(1);
| +++++ +
12 | let _: E = E::B { f: 1 };
| +++++++++ +
```
r? `@compiler-errors`
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Layout things
These two commits are pretty independent, but didn't seem worth doing individual PRs for:
- Always check that size is a multiple of align, even without debug assertions
- Change Layout debug printing to put `variants` last, since it often huge and not usually the part we are most interested in
Cc `@eddyb`
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`-Z location-detail`: provide option to disable all location details
As reported [here](https://github.com/rust-lang/rust/pull/89920#issuecomment-1190598924), when I first implemented the `-Z location-detail` flag there was a bug, where passing an empty list was not correctly supported, and instead rejected by the compiler. This PR fixes that such that passing an empty list results in no location details being tracked, as originally specified in https://github.com/rust-lang/rfcs/pull/2091 .
This PR also adds a test case to verify that this option continues to work as intended.
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Remove implicit names and values from `--cfg` in `--check-cfg`
This PR remove the implicit names and values from `--cfg` in `--check-cfg` because the behavior is quite surprising but also because it's really easy to inadvertently really on the implicitness and when the `--cfg` is not set anymore to have an unexpected warning from an unexpected condition that pass with the implicitness.
This change in behavior will also enable us to warn when an unexpected `--cfg` is passed, ex: the user wrote `--cfg=unstabl` instead of `--cfg=unstable`. The implementation of the warning will be done in a follow-up PR.
cc `@petrochenkov`
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TaKO8Ki:suggest-removing-semicolon-and-boxing-the-expressions, r=compiler-errors
Suggest removing a semicolon and boxing the expressions for if-else
`InferCtxt::suggest_remove_semi_or_return_binding` was not working well, so I fixed it and added a ui test.
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Use `impl`'s generics when suggesting fix on bad `impl Copy`
See the UI test for a more complicated example, but we weren't correctly suggesting to add bounds given a manual `impl` whose generics didn't match the struct generics.
```rust
#[derive(Clone)]
struct Wrapper<T>(T);
impl<S> Copy for Wrapper<S> {}
```
Coincidentally this fix didn't cause any regressions for `derive(Copy)` impls, I think because those use the same spans in the impl generics as the struct generics, so the machinery still applies the same change.
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well for if-else
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Fix the size of niche enums with ZST alignment
For enums with an aligned ZST variant, like `[T; 0]`, the niche layout
was not computing a sufficient size to be consistent with alignment. Now
we pad that size up to the alignment, and also make sure to only use the
niche variant's ABI when the size and alignment still match.
Fixes #99836
r? `@eddyb`
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Do not allow bad projection term to leak into the type checker
Fixes #99828
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For enums with an aligned ZST variant, like `[T; 0]`, the niche layout
was not computing a sufficient size to be consistent with alignment. Now
we pad that size up to the alignment, and also make sure to only use the
niche variant's ABI when the size and alignment still match.
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Add diagnostic when using public instead of pub
Forwarding from https://github.com/rust-lang/rust/pull/99706
I accidentally broke something(??) in git and the commits in that PR are absolutely not what I did in that branch
Anyways, this is the PR for this now. Adding tests again in a minute.
cc `@davidtwco`
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don't call type ascription "cast"
Noticed in #99885
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Improve type mismatch w/ function signatures
This PR makes use of `note: expected/found` (instead of labeling types in labels) in type mismatch with function signatures. Pros: it's easier to compare the signatures, cons: the error is a little more verbose now.
This is especially nice when
- The signatures differ in a small subset of parameters (same parameters are elided)
- The difference is in details, for example `isize` vs `usize` (there is a better chance that the types align)
Also this PR fixes the inconsistency in variable names in the edited code (`expected` and `found`).
A zulip thread from which this pr started: [[link]](https://rust-lang.zulipchat.com/#narrow/stream/147480-t-compiler.2Fwg-diagnostics/topic/Type.20error.20regression.3F.2E.2E.2E/near/289756602).
An example diagnostic:
<table>
<tr>
<th>this pr</th>
<th>nightly</th>
</tr>
<tr>
<td>
```text
error[E0631]: type mismatch in function arguments
--> ./t.rs:4:12
|
4 | expect(&f);
| ------ ^^ expected due to this
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| required by a bound introduced by this call
...
10 | fn f(_: isize, _: u8, _: Vec<u32>) {}
| ---------------------------------- found signature defined here
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= note: expected function signature `fn(usize, _, Vec<u64>) -> _`
found function signature `fn(isize, _, Vec<u32>) -> _`
note: required because of the requirements on the impl of `Trait` for `fn(isize, u8, Vec<u32>) {f}`
--> ./t.rs:8:9
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8 | impl<F> Trait for F where F: Fn(usize, u8, Vec<u64>) -> u8 {}
| ^^^^^ ^
= note: required for the cast from `fn(isize, u8, Vec<u32>) {f}` to the object type `dyn Trait`
```
</td>
<td>
```text
error[E0631]: type mismatch in function arguments
--> ./t.rs:4:12
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4 | expect(&f);
| ------ ^^ expected signature of `fn(usize, u8, Vec<u64>) -> _`
| |
| required by a bound introduced by this call
...
10 | fn f(_: isize, _: u8, _: Vec<u32>) {}
| ---------------------------------- found signature of `fn(isize, u8, Vec<u32>) -> _`
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note: required because of the requirements on the impl of `Trait` for `fn(isize, u8, Vec<u32>) {f}`
--> ./t.rs:8:9
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8 | impl<F> Trait for F where F: Fn(usize, u8, Vec<u64>) -> u8 {}
| ^^^^^ ^
= note: required for the cast to the object type `dyn Trait`
```
</td>
</tr>
</table>
<details><summary>code</summary>
<p>
```rust
fn main() {
fn expect(_: &dyn Trait) {}
expect(&f);
}
trait Trait {}
impl<F> Trait for F where F: Fn(usize, u8, Vec<u64>) -> u8 {}
fn f(_: isize, _: u8, _: Vec<u32>) {}
```
</p>
</details>
r? `@compiler-errors`
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use `check_region_obligations_and_report_errors` to avoid ICEs
If we don't call `process_registered_region_obligations` before `resolve_regions_and_report_errors` then we'll ICE if we have any region obligations, and `check_region_obligations_and_report_errors` just does both of these for us in a nice convenient function.
Fixes #53475
r? types
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Rollup of 8 pull requests
Successful merges:
- #99227 (Fix thumbv4t-none-eabi frame pointer setting)
- #99518 (Let-else: break out scopes when a let-else pattern fails to match)
- #99671 (Suggest dereferencing index when trying to use a reference of usize as index)
- #99831 (Add Fuchsia platform support documentation)
- #99881 (fix ICE when computing codegen_fn_attrs on closure with non-fn parent)
- #99888 (Streamline lint checking)
- #99891 (Adjust an expr span to account for macros)
- #99904 (Cleanup html whitespace)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
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Adjust an expr span to account for macros
Fix this erroneous suggestion:
```
error[E0529]: expected an array or slice, found `Vec<{integer}>`
--> /home/gh-compiler-errors/test.rs:2:9
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2 | let [..] = vec![1, 2, 3];
| ^^^^ pattern cannot match with input type `Vec<{integer}>`
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help: consider slicing here
--> /home/gh-compiler-errors/rust2/library/alloc/src/macros.rs:50:36
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50~ $crate::__rust_force_expr!(<[_]>::into_vec(
51+ #[rustc_box]
52+ $crate::boxed::Box::new([$($x),+])
53~ )[..])
```
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fix ICE when computing codegen_fn_attrs on closure with non-fn parent
Other call sites check `has_codegen_attrs` first, so let's do that too.
Fixes #99876
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Suggest dereferencing index when trying to use a reference of usize as index
fixes #96678
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Let-else: break out scopes when a let-else pattern fails to match
This PR will commit to a new behavior so that values from initializer expressions are dropped earlier when a let-else pattern fails to match.
Fix #98672.
Close #93951.
cc `@camsteffen` `@est31`
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anonymize all bound vars, not just regions
fixes #98702
r? types
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For example, this fixes a error for `impl fn()` (notice the capitalization)
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flag '-l link-arg=___ was added
#99427
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Rollup of 8 pull requests
Successful merges:
- #99686 (add suggestion when there is a impl of external trait on pointer with wrong coherence rules)
- #99760 (doc/rustc: describe the uefi target platforms)
- #99766 (Htmldocck: Substitute the doc channel when blessing)
- #99781 (Use String::from_utf8_lossy in CStr demo)
- #99803 (Update mentions to `rustc_metadata::rmeta::Lazy`)
- #99845 (Remove `$` prefix for bash scripts in doc)
- #99850 (rustdoc: Remove more Clean trait implementations)
- #99872 (Clone the `src/llvm-project` submodule if profiling is enabled)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
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add suggestion when there is a impl of external trait on pointer with wrong coherence rules
Closes https://github.com/rust-lang/rust/issues/99572
This will try to improve the node in the error message by suggesting a general solution because the solution, in this case, is application depended.
I'm not super happy regarding the code quality, but I'm happy to have feedback on it.
`@rustbot` r? `@compiler-errors`
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