When encountering struct fn call literal with private fields, suggest all builders
When encountering code like `Box(42)`, suggest `Box::new(42)` and *all* other associated functions that return `-> Box<T>`.
Add a way to give pre-sorted suggestions.
Ensure sanity of all computed ABIs
This moves the ABI sanity assertions from the codegen backend to the ABI computation logic. Sadly, due to past mistakes, we [have to](https://github.com/rust-lang/rust/pull/117351#issuecomment-1788495503) be able to compute a sane ABI for nonsensical function types like `extern "C" fn(str) -> str`. So to make the sanity check pass we first need to make all ABI adjustment deal with unsized types... and we have no shared infrastructure for those adjustments, so that's a bunch of copy-paste. At least we have assertions failing loudly when one accidentally sets a different mode for an unsized argument.
To achieve this, this re-lands the parts of https://github.com/rust-lang/rust/pull/80594 that got reverted in https://github.com/rust-lang/rust/pull/81388. To avoid breaking wasm ABI again, that ABI now explicitly opts-in to the (wrong, broken) ABI that we currently keep for backwards compatibility. That's still better than having *every* ABI use the wrong broken default!
Cc `@bjorn3`
Fixes https://github.com/rust-lang/rust/issues/115845
Lint pinned `#[must_use]` pointers (in particular, `Box<T>` where `T` is `#[must_use]`) in `unused_must_use`.
Fixes: #111458
This is motivated by a common async/await pattern:
```rs
fn foo() -> Pin<Box<dyn Future<Output = i32>>> {
Box::pin(async { 42 })
}
// call `foo`, but forget to await the result
foo();
```
Unlike with `async fn` or return position `impl Future`, this does not currently warn the user that the `Future` is unused.
To fix this, I've extended the `unused_must_use` lint to catch `Pin<P>`, where `P` must be used. In particular, this applies to `Pin<Box<T>>`, where `T` must be used. I'm not sure if there are other pointers where this applies, but I can't think of any situation the user wouldn't want to be warned.
Suggest field typo through derefs
Take into account implicit dereferences when suggesting fields.
```
error[E0609]: no field `longname` on type `Arc<S>`
--> $DIR/suggest-field-through-deref.rs:10:15
|
LL | let _ = x.longname;
| ^^^^^^^^ help: a field with a similar name exists: `long_name`
```
CC https://github.com/rust-lang/rust/issues/78374#issuecomment-719564114
Remove option_payload_ptr; redundant to offset_of
The `option_payload_ptr` intrinsic is no longer required as `offset_of` supports traversing enums (#114208). This PR removes it in order to dogfood offset_of (as suggested at https://github.com/rust-lang/rust/issues/106655#issuecomment-1790907626). However, it will not build until those changes reach beta (which I think is within the next 8 days?) so I've opened it as a draft.
When a local binding shadows a fn, point at fn def in call failure
When a local binding shadows a function that is then called, this local binding will cause an E0618 error. We now point not only at the binding definition, but also at the locally defined function of the same name.
```
error[E0618]: expected function, found `&str`
--> $DIR/issue-22468.rs:3:13
|
LL | let foo = "bar";
| --- `foo` has type `&str`
LL | let x = foo("baz");
| ^^^-------
| |
| call expression requires function
...
LL | fn foo(file: &str) -> bool {
| -------------------------- this function of the same name is available here, but it shadowed by the local binding of the same name
```
Fix#53841
Add some additional warnings for duplicated diagnostic items
This commit adds warnings if a user supplies several diagnostic options where we can only apply one of them. We explicitly warn about ignored options here. In addition a small test for these warnings is added.
r? `@compiler-errors`
For now that's the last PR to improve the warnings generated by misused `#[diagnostic::on_unimplemented]` attributes. I'm not sure what needs to be done next to move this closer to stabilization.
When a local binding shadows a function that is then called, this local
binding will cause an E0618 error. We now point not only at the binding
definition, but also at the locally defined function of the same name.
```
error[E0618]: expected function, found `&str`
--> $DIR/issue-22468.rs:3:13
|
LL | let foo = "bar";
| --- `foo` has type `&str`
LL | let x = foo("baz");
| ^^^-------
| |
| call expression requires function
...
LL | fn foo(file: &str) -> bool {
| -------------------------- this function of the same name is avalable here, but it shadowed by the local binding of the same name
```
Fix#53841
When using existing fn as module, don't claim it doesn't exist
Tweak wording of module not found in resolve, when the name exists but belongs to a non-`mod` item.
Fix#81232.
Emit smir
This adds ability to `-Zunpretty=smir` and get smir output of a Rust file, this is obliviously pretty basic compared to `mir` output but I think we could iteratively improve it, and even at this state this is useful for us.
r? ``@celinval``
Remove asmjs
Fulfills [MCP 668](https://github.com/rust-lang/compiler-team/issues/668).
`asmjs-unknown-emscripten` does not work as-specified, and lacks essential upstream support for generating asm.js, so it should not exist at all.
More detail when expecting expression but encountering bad macro argument
On nested macro invocations where the same macro fragment changes fragment type from one to the next, point at the chain of invocations and at the macro fragment definition place, explaining that the change has occurred.
Fix#71039.
```
error: expected expression, found pattern `1 + 1`
--> $DIR/trace_faulty_macros.rs:49:37
|
LL | (let $p:pat = $e:expr) => {test!(($p,$e))};
| ------- -- this is interpreted as expression, but it is expected to be pattern
| |
| this macro fragment matcher is expression
...
LL | (($p:pat, $e:pat)) => {let $p = $e;};
| ------ ^^ expected expression
| |
| this macro fragment matcher is pattern
...
LL | test!(let x = 1+1);
| ------------------
| | |
| | this is expected to be expression
| in this macro invocation
|
= note: when forwarding a matched fragment to another macro-by-example, matchers in the second macro will see an opaque AST of the fragment type, not the underlying tokens
= note: this error originates in the macro `test` (in Nightly builds, run with -Z macro-backtrace for more info)
```
I find `Compilation::and_then` hard to read. This commit removes it,
simplifying the control flow in `run_compiler`, and reducing the number
of lines of code.
In particular, `list_metadata` and `process_try_link` (renamed `rlink`)
are now only called if the relevant condition is true, rather than that
condition being checked within the function.
Currently we have an inconsistency between the "input" and "no input"
cases:
- no input: `rustc --print=sysroot -Whelp` prints the lint help.
- input: `rustc --print=sysroot -Whelp a.rs` prints the sysroot.
It makes sense to print the lint help in both cases, because that's what
happens with `--help`/`-Zhelp`/`-Chelp`.
In fact, the `describe_lints` in the "input" case happens amazingly
late, after *parsing*. This is because, with plugins, lints used to be
registered much later, when the global context was created. But #117649
moved lint registration much earlier, during session construction.
So this commit moves the `describe_lints` call to a single spot for both
for both the "input" and "no input" cases, as early as possible. This is
still not as early as `--help`/`-Zhelp`/`-Chelp`, because `-Whelp` must
wait until the session is constructed.
`rustc_driver_impl::run_compiler` currently has two
`interface::run_compiler` calls: one for the "no input" case, and one
for the normal case.
This commit merges the former into the latter, which makes the control
flow easier to read and avoids some duplication.
It also makes it clearer that the "no input" case will describe lints
before printing crate info, while the normal case does it in the reverse
order. Possibly a bug?
Yes, its type is `EarlyErrorHandler`, but there is another value of that
type later on in the function called `handler` that is initialized with
`sopts.error_format`. So `default_handler` is a better name because it
clarifies that it is initialized with `ErrorOutputType::default()`.
ignore implied bounds with placeholders
given the following code:
```rust
trait Trait {
type Ty<'a> where Self: 'a;
}
impl<T> Trait for T {
type Ty<'a> = () where Self: 'a;
}
struct Foo<T: Trait>(T)
where
for<'x> T::Ty<'x>: Sized;
```
when computing the implied bounds from `Foo<X>` we incorrectly get the bound `X: !x` from the normalization of ` for<'x> <X as Trait>::Ty::<'x>: Sized`. This is a a known bug! we shouldn't use the constraints that arise from normalization as implied bounds. See #109628.
Ignore these bounds for now. This should prevent later ICEs.
Fixes#112250Fixes#107409
new solver normalization improvements
cool beans
At the core of this PR is a `try_normalize_ty` which stops for rigid aliases by using `commit_if_ok`.
Reworks alias-relate to fully normalize both the lhs and rhs and then equate the resulting rigid (or inference) types. This fixes https://github.com/rust-lang/trait-system-refactor-initiative/issues/68 by avoiding the exponential blowup. Also supersedes #116369 by only defining opaque types if the hidden type is rigid.
I removed the stability check in `EvalCtxt::evaluate_goal` due to https://github.com/rust-lang/trait-system-refactor-initiative/issues/75. While I personally have opinions on how to fix it, that still requires further t-types/`@nikomatsakis` buy-in, so I removed that for now. Once we've decided on our approach there, we can revert this commit.
r? `@compiler-errors`
