All the slice interners have a wrapper that handles the empty slice
case. We can instead handle this in the `slice_interners!` macro,
avoiding the need for most of the wrappers, and allowing the interner
functions to be renamed from `_intern_foos` to `intern_foos`.
The two exceptions:
- intern_predicates: I kept this wrapper because there's a FIXME
comment about a possible future change.
- intern_poly_existential_predicates: I kept this wrapper because it
asserts that the slice is empty and sorted.
Add new lint no_mangle_with_rust_abi
Fixes issue #10347
This PR adds a new lint `no_mangle_with_rust_abi` that suggests converting a function to the C ABI to if the function has the `#[no_mangle]` attribute and `Abi == Abi::Rust`. It will not run for any of the other variants defined in [rustc_target::spec::abi::Abi](https://doc.rust-lang.org/beta/nightly-rustc/rustc_target/spec/abi/enum.Abi.html), nor suggest any conversion other than conversion to the C ABI.
Functions that explicitly opt into the Rust ABI with `extern "Rust"` are ignored by this lint.
---
changelog: [`no_mangle_with_rust_abi`]: add lint that converts Rust ABI functions with the `#[no_mangle]` attribute to C ABI
Previously, there were two queries to check whether a type allows the
0x01 or zeroed bitpattern.
I am planning on adding a further initness to check, truly uninit for
MaybeUninit, which would make this three queries. This seems overkill
for such a small feature, so this PR unifies them into one.
Consider `tests/ui/const-generics/generic_const_exprs/issue-102768.stderr`,
the error message where it gives additional notes about where the associated
type is defined, and how the dead code lint doesn't have an article,
like in `tests/ui/lint/dead-code/issue-85255.stderr`. They don't have
articles, so it seems unnecessary to have one here.
Fix more false positives for `extra_unused_type_parameters`
Builds on #10321. All empty functions are no longer linted, instead of just those that have trait bounds on them. Also, if a trait bound contains a non-public trait (un-exported, but still potentially reachable), then the corresponding type parameter isn't linted.
Finally, added support for the `avoid_breaking_exported_api` config option.
r? `@flip1995`
changelog: none
As reported in sunfishcode/is-terminal#18, there are situations where
`GetFileInformationByHandleEx` can write a file name length that is
longer than the provided buffer. To avoid deferencing memory past the
end of the buffer, use a bounds-checked function to form a slice to
the buffer and handle the out-of-bounds case.
This ports the fix from sunfishcode/is-terminal#19 to std's `is_terminal`
implementation.
As a part of drop elaboration, we identify dead unwinds, i.e., unwind
edges on a drop terminators which are known to be unreachable, because
there is no need to drop anything.
Previously, the data flow framework was informed about the dead unwinds,
and it assumed those edges are absent from MIR. Unfortunately, the data
flow framework wasn't consistent in maintaining this assumption.
In particular, if a block was reachable only through a dead unwind edge,
its state was propagated to other blocks still. This became an issue in
the context of change removes DropAndReplace terminator, since it
introduces initialization into cleanup blocks.
To avoid this issue, remove unreachable unwind edges before the drop
elaboration, and elaborate only blocks that remain reachable.
We currently provide wrong suggestions and unhelpful errors on closure
bodies with braces missing. For example, given the following code:
```
fn main() {
let _x = Box::new(|x|x+1;);
}
```
the current output is like this:
```
error: expected expression, found `)`
--> ./main.rs:2:30
|
2 | let _x = Box::new(|x|x+1;);
| ^ expected expression
error: closure bodies that contain statements must be surrounded by braces
--> ./main.rs:2:25
|
2 | let _x = Box::new(|x|x+1;);
| ^
3 | }
| ^
|
...
help: try adding braces
|
2 ~ let _x = Box::new(|x| {x+1;);
3 ~ }}
...
error: expected `;`, found `}`
--> ./main.rs:2:32
|
2 | let _x = Box::new(|x|x+1;);
| ^ help: add `;` here
3 | }
| - unexpected token
error: aborting due to 3 previous errors
```
This commit allows outputting correct suggestions and errors. The above
code would output like this:
```
error: closure bodies that contain statements must be surrounded by braces
--> ./main.rs:2:25
|
2 | let _x = Box::new(|x|x+1;);
| ^ ^
|
note: statement found outside of a block
--> ./main.rs:2:29
|
2 | let _x = Box::new(|x|x+1;);
| ---^ this `;` turns the preceding closure into a statement
| |
| this expression is a statement because of the trailing semicolon
note: the closure body may be incorrectly delimited
--> ./main.rs:2:23
|
2 | let _x = Box::new(|x|x+1;);
| ^^^^^^ - ...but likely you meant the closure to end here
| |
| this is the parsed closure...
help: try adding braces
|
2 | let _x = Box::new(|x| {x+1;});
| + +
error: aborting due to previous error
```
Use `tcx.ty_error_with_guaranteed` in more places, rename variants
1. Use `ty_error_with_guaranteed` more so we don't delay so many span bugs
2. Rename `ty_error_with_guaranteed` to `ty_error`, `ty_error` to `ty_error_misc`. This is to incentivize using the former over the latter in cases where we already are witness to a `ErrorGuaranteed` token.
Second commit is just name replacement, so the first commit can be reviewed on its own with more scrutiny.
The point of these is to be seen lexically in the docs, so they should always be passed as the correct literal, not as an expression.
(Otherwise we could just compute `Min`/`Max` from `BITS`, for example.)
Add git config command to `.git-blame-ignore-revs`
I always have to look at the git blame for that file to find the git command in the commit message (luckily that commit isn't in the file :D), putting it directly in the file makes it easier to find. Maybe we should mention the config in some other place as well.
Use associated type bounds in some places in the compiler
Use associated type bounds for some nested `impl Trait<Assoc = impl Trait2>` cases. I'm generally keen to introduce new lang features that are more mature into the compiler, but maybe let's see what others think?
Side-note: I was surprised that the only use-cases of nested impl trait in the compiler are just iterator related?!
rustdoc: Prevent duplicated imports
Fixes#108163.
Interestingly enough, the AST is providing us an import for each corresponding item, even though the `Res` links to multiple ones each time, which leaded to the same import being duplicated.
So in this PR, I decided to prevent the add of the import before the clean pass. However, I originally took a different path by instead filtering after cleaning the path. You can see it [here](https://github.com/rust-lang/rust/compare/master...GuillaumeGomez:rust:fix-duplicated-imports?expand=1). Only the second commit differs.
I think this approach is better though, but at least we can compare both if we want.
The first commit adds the check for duplicated items in the rustdoc-json output as asked in #108163.
cc `@aDotInTheVoid`
r? `@notriddle`
Windows: Quote more batch file arguments
Make sure to always quote batch file arguments that contain command prompt special characters.
Additionally add `/d` command line parameter to disable any autorun scripts that may change the way variable expansion works. This makes it more consistent across systems and may help avoid surprises.
## Background Info
[`CreateProcess`](https://learn.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-createprocessw) with the `lpApplicationName` set can only be used to run `.exe` files and not script files such as `.bat`. However, for historical reasons, we do have special handling so that `.bat` files will be correctly run with `cmd.exe` as the application.
In Windows, command line arguments are passed as a single string (not an array). Applications can parse this string however they like but most follow the standard MSVC C/C++ convention. But `cmd.exe` uses different argument parsing rules to other Windows programs (because it emulates old DOS). This PR aims to help smooth over some of the differences.
r? libs
Correctly handle aggregates in DataflowConstProp
The previous implementation from https://github.com/rust-lang/rust/pull/107411 flooded target of an aggregate assignment with `Bottom`, corresponding to the `deinit` that the interpreter does.
As a consequence, when assigning `target = Enum::Variant#i(...)` all the `(target as Variant#j)` were at `Bottom` while they should have been `Top`.
This PR replaces that flooding with `Top`.
Aside, it corrects a second bug where the wrong place would be used to assign to enum variant fields, resulting to nothing happening.
Fixes https://github.com/rust-lang/rust/issues/108166
Ban associated type bounds in bad positions
We should not try to lower associated type bounds into TAITs in positions where `impl Trait` is not allowed (except for in `where` clauses, like `where T: Trait<Assoc: Bound>`).
This is achieved by using the same `rustc_ast_lowering` machinery as impl-trait does to characterize positions as universal/existential/disallowed.
Fixes#106077
Split out the first commit into #108066, since it's not really related.
".. since this instant was created" is inaccurate and misleading,
consider the following case:
let i1 = Instant::now(); // i1 is created at T1
let i2 = i1 + Duration::from_nanos(0); // i2 is "created" at T2
i2.elapsed(); // at T3
Per the current description, `elapsed()` at T3 should return T3 - T2?
Therefore removes the "was created" in the description of
{Instant,SystemTime}::elapsed(). And since these types represent times,
it's OK to use prepostions with them, e.g. "since this instant".
