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StableCompare is a companion trait to `StableOrd`. Some types like `Symbol` can be compared in a cross-session stable way, but their `Ord` implementation is not stable. In such cases, a `StableOrd` implementation can be provided to offer a lightweight way for stable sorting. (The more heavyweight option is to sort via `ToStableHashKey`, but then sorting needs to have access to a stable hashing context and `ToStableHashKey` can also be expensive as in the case of `Symbol` where it has to allocate a `String`.)
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Clarify how to choose a FutureIncompatibilityReason variant.
There has been some confusion about how to choose these variants, or what the procedure is for handling future-incompatible errors. Hopefully this helps provide some more information on how these work.
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There has been some confusion about how to choose these variants, or
what the procedure is for handling future-incompatible errors. Hopefully
this helps provide some more information on how these work.
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They've been deprecated for four years.
This commit includes the following changes.
- It eliminates the `rustc_plugin_impl` crate.
- It changes the language used for lints in
`compiler/rustc_driver_impl/src/lib.rs` and
`compiler/rustc_lint/src/context.rs`. External lints are now called
"loaded" lints, rather than "plugins" to avoid confusion with the old
plugins. This only has a tiny effect on the output of `-W help`.
- E0457 and E0498 are no longer used.
- E0463 is narrowed, now only relating to unfound crates, not plugins.
- The `plugin` feature was moved from "active" to "removed".
- It removes the entire plugins chapter from the unstable book.
- It removes quite a few tests, mostly all of those in
`tests/ui-fulldeps/plugin/`.
Closes #29597.
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Rollup of 6 pull requests
Successful merges:
- #114959 (fix #113702 emit a proper diagnostic message for unstable lints passed from CLI)
- #115011 (Warn on elided lifetimes in associated constants (`ELIDED_LIFETIMES_IN_ASSOCIATED_CONSTANT`))
- #115077 (Do not emit invalid suggestion in E0191 when spans overlap)
- #115087 (Add disclaimer on size assertion macro)
- #115090 (Always use `os-release` rather than `/lib` to detect `NixOS` (bootstrap))
- #115101 (triagebot: add dependency licensing pings)
r? `@ghost`
`@rustbot` modify labels: rollup
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item
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Querify register_tools and post-expansion early lints
The 2 extra queries correspond to code that happen before and after macro expansion, and don't need the resolver to exist.
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Currently, deriving on packed structs has some non-trivial limitations,
related to the fact that taking references on unaligned fields is UB.
The current approach to field accesses in derived code:
- Normal case: `&self.0`
- In a packed struct that derives `Copy`: `&{self.0}`
- In a packed struct that doesn't derive `Copy`: `&self.0`
Plus, we disallow deriving any builtin traits other than `Default` for any
packed generic type, because it's possible that there might be
misaligned fields. This is a fairly broad restriction.
Plus, we disallow deriving any builtin traits other than `Default` for most
packed types that don't derive `Copy`. (The exceptions are those where the
alignments inherently satisfy the packing, e.g. in a type with
`repr(packed(N))` where all the fields have alignments of `N` or less
anyway. Such types are pretty strange, because the `packed` attribute is
not having any effect.)
This commit introduces a new, simpler approach to field accesses:
- Normal case: `&self.0`
- In a packed struct: `&{self.0}`
In the latter case, this requires that all fields impl `Copy`, which is
a new restriction. This means that the following example compiles under
the old approach and doesn't compile under the new approach.
```
#[derive(Debug)]
struct NonCopy(u8);
#[derive(Debug)
#[repr(packed)]
struct MyType(NonCopy);
```
(Note that the old approach's support for cases like this was brittle.
Changing the `u8` to a `u16` would be enough to stop it working. So not
much capability is lost here.)
However, the other constraints from the old rules are removed. We can now
derive builtin traits for packed generic structs like this:
```
trait Trait { type A; }
#[derive(Hash)]
#[repr(packed)]
pub struct Foo<T: Trait>(T, T::A);
```
To allow this, we add a `T: Copy` bound in the derived impl and a `T::A:
Copy` bound in where clauses. So `T` and `T::A` must impl `Copy`.
We can now also derive builtin traits for packed structs that don't derive
`Copy`, so long as the fields impl `Copy`:
```
#[derive(Hash)]
#[repr(packed)]
pub struct Foo(u32);
```
This includes types that hand-impl `Copy` rather than deriving it, such as the
following, that show up in winapi-0.2:
```
#[derive(Clone)]
#[repr(packed)]
struct MyType(i32);
impl Copy for MyType {}
```
The new approach is simpler to understand and implement, and it avoids
the need for the `unsafe_derive_on_repr_packed` check.
One exception is required for backwards-compatibility: we allow `[u8]`
fields for now. There is a new lint for this,
`byte_slice_in_packed_struct_with_derive`.
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Fix `SingleUseLifetime` ICE
Fixes #104440
cc: ``@matthiaskrgr``
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duplicated code r=ozkanonur
Signed-off-by: ozkanonur <work@onurozkan.dev>
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This reverts commit 2cb9a65684dba47c52de8fa938febf97a73e70a9, reversing
changes made to 750bd1a7ff3e010611b97ee75d30b7cbf5f3a03c.
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keyword_lifetime, invalid_label, invalid_visibility
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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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Address issue #99265 by checking each positionally used argument
to see if the argument is named and adding a lint to use the name
instead. This way, when named arguments are used positionally in a
different order than their argument order, the suggested lint is
correct.
For example:
```
println!("{b} {}", a=1, b=2);
```
This will now generate the suggestion:
```
println!("{b} {a}", a=1, b=2);
```
Additionally, this check now also correctly replaces or inserts
only where the positional argument is (or would be if implicit).
Also, width and precision are replaced with their argument names
when they exists.
Since the issues were so closely related, this fix for issue #99265
also fixes issue #99266.
Fixes #99265
Fixes #99266
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Addresses Issue 98466 by emitting a warning if a named argument
is used like a position argument (i.e. the name is not used in
the string to be formatted).
Fixes rust-lang#98466
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r=wesleywiser
Finishing touches for `#[expect]` (RFC 2383)
This PR adds documentation and some functionality to rustc's lint passes, to manually fulfill expectations. This is needed for some lints in Clippy. Hopefully, it should be one of the last things before we can move forward with stabilizing this feature.
As part of this PR, I've also updated `clippy::duplicate_mod` to showcase how this new functionality can be used and to ensure that it works correctly.
---
changelog: [`duplicate_mod`]: Fixed lint attribute interaction
r? `@wesleywiser`
cc: https://github.com/rust-lang/rust/issues/97660, https://github.com/rust-lang/rust/issues/85549
And I guess that's it. Here have a magical unicorn :unicorn:
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