Add `$message_type` field to distinguish json diagnostic outputs
Currently the json-formatted outputs have no way to unambiguously determine which kind of message is being output. A consumer can look for specific fields in the json object (eg "message"), but there's no guarantee that in future some other kind of output will have a field of the same name.
This PR adds a `"type"` field to add json outputs which can be used to unambiguously determine which kind of output it is. The mapping is:
`diagnostic`: regular compiler diagnostics
`artifact`: artifact notifications
`future_incompat`: Future incompatibility report
`unused_extern`: Unused crate warnings/errors
This matches the "internally tagged" representation for serde enums.
Add place.ty() and Ty build from a kind to smir
Add a method to retrieve the type of a place and a few utility functions needed to build the projection type. I decided to return a result to avoid panicking if the user passes invalid inputs, such as wrong list of locals.
r? `@spastorino`
Don't consider regions in `deref_into_dyn_supertrait` lint
I actually wonder if we should just warn on *any* deref impl with a target type that matches a supertrait by *def-id*.
cc #89460
r? types
Typeck break expr even if break is illegal
Fixes#117821
We were returning immediately when encountering an illegal break. However, this caused problems later when the expr that the break was returning was evaluated during writeback. So now we don't return and instead simply set tainted by error. This lets typeck of break expr to occur even though we've encountered an illegal break.
Don't require intercrate mode for negative coherence
Negative coherence needs to be *sound*, but does not need to be *complete*, since it's looking for the *existence* of a negative goal, not the non-existence of a positive goal.
This removes some trivial and annoying ambiguities when a negative impl has region constraints.
r? lcnr idk if this needs an fcp but if it does, pls kick it off
Note about object lifetime defaults in does not live long enough error
This is a aspect of Rust that frequently trips up people who are not aware of it yet. This diagnostic attempts to explain what's happening and why the lifetime constraint, that was never mentioned in the source, arose.
The implementation feels a bit questionable, I'm not sure whether there are better ways to do this. There probably are.
fixes#117835
r? types
Add a test to ensure issue #89699 does not show up again. This test
emits an `async move` closure in a proc macro, which is used in a
test program compiled with edition 2015. We make sure the error message
is nice and shows up properly.
Rollup of 8 pull requests
Successful merges:
- #117828 (Avoid iterating over hashmaps in astconv)
- #117832 (interpret: simplify handling of shifts by no longer trying to handle signed and unsigned shift amounts in the same branch)
- #117891 (Recover `dyn` and `impl` after `for<...>`)
- #117957 (if available use a Child's pidfd for kill/wait)
- #117988 (Handle attempts to have multiple `cfg`d tail expressions)
- #117994 (Ignore but do not assume region obligations from unifying headers in negative coherence)
- #118000 (Make regionck care about placeholders in outlives components)
- #118068 (subtree update cg_gcc 2023/11/17)
r? `@ghost`
`@rustbot` modify labels: rollup
We were earlier returning immediately when encountering an illegal break. However, this caused problems later
when the expr that the break was returning was evaluated during writeback. So now we don't return and instead
simply set tainted by error. This lets typeck of break expr to occur even though we've encountered an illegal break.
Fix insertion of statements to be executed along return edge in inlining
Inlining creates additional statements to be executed along the return
edge: an assignment to the destination, storage end for temporaries.
Previously those statements where inserted directly into a call target,
but this is incorrect when the target has other predecessors.
Avoid the issue by creating a new dedicated block for those statements.
When the block happens to be redundant it will be removed by CFG
simplification that follows inlining.
Fixes#117355
Inlining creates additional statements to be executed along the return
edge: an assignment to the destination, storage end for temporaries.
Previously those statements where inserted directly into a call target,
but this is incorrect when the target has other predecessors.
Avoid the issue by creating a new dedicated block for those statements.
When the block happens to be redundant it will be removed by CFG
simplification that follows inlining.
Fixes#117355
Make regionck care about placeholders in outlives components
Currently, we don't consider a placeholder type `!T` to be a type component when it comes to processing type-outlives obligations. This means that they are essentially treated like unit values with no sub-components, and always outlive any region. This is problematic for `non_lifetime_binders`, and even more problematic for `with_negative_coherence`, since negative coherence uses placeholders as universals.
This PR adds `Component::Placeholder` which acts much like `Component::Param`. This currently causes a regression in some non-lifetime-binders tests because `for<T> T: 'static` doesn't imply itself when processing outlives obligations, so code like this will fail:
```
fn foo() where for<T> T: 'static {
foo() //~ fails
}
```
Since the where clause doesn't imply itself. This requires making the `MatchAgainstHigherRankedOutlives` relation smarter when it comes to binders.
r? types
Ignore but do not assume region obligations from unifying headers in negative coherence
Partly addresses a FIXME that was added in #112875. Just as we can throw away the nested trait/projection obligations from unifying two impl headers, we can also just throw away the region obligations too.
I removed part of the FIXME that was incorrect, namely:
> Given that the only region constraints we get are involving inference regions in the root, it shouldn't matter, but still sus.
This is not true when unifying `fn(A)` and `for<'b> fn(&'b B)` which ends up with placeholder region outlives from non-root universes. I'm pretty sure this is okay, though it would be nice if we were to use them as assumptions. See the `explicit` revision of the test I committed, which still fails.
Fixes#117986
r? lcnr, feel free to reassign tho.
Recover `dyn` and `impl` after `for<...>`
Recover `dyn` and `impl` after `for<...>` in types. Reuses the logic for parsing bare trait objects, so it doesn't fix cases like `for<'a> dyn Trait + dyn Trait` or anything, but that seems somewhat of a different issue.
Parsing recovery logic is a bit involved, but I couldn't find a way to simplify it.
Fixes#117882
interpret: simplify handling of shifts by no longer trying to handle signed and unsigned shift amounts in the same branch
While we're at it, also update comments in codegen and MIR building related to shifts, and fix the overflow error printed by Miri on negative shift amounts.
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
rustdoc-search: optimize unifyFunctionTypes
Final profile output:
https://notriddle.com/rustdoc-html-demo-5/profile-4/index.html
This PR contains three commits that improve performance of this hot inner loop: reduces the number of allocations, a fast path for the 1-element basic query case, and reconstructing the multi-element query case to use recursion instead of an explicit `backtracking` array. It also adds new test cases that I found while working on this.
r? `@GuillaumeGomez`
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
