fix: Wrong BoundVar index when lowering impl trait parameter of parent generics
Fixes#17711
From the following test code;
```rust
//- minicore: deref
use core::ops::Deref;
struct Struct<'a, T>(&'a T);
trait Trait {}
impl<'a, T: Deref<Target = impl Trait>> Struct<'a, T> {
fn foo(&self) -> &Self { self }
fn bar(&self) {
let _ = self.foo();
}
}
```
when we call `register_obligations_for_call` for `let _ = self.foo();`,
07659783fd/crates/hir-ty/src/infer/expr.rs (L1939-L1952)
we are querying `generic_predicates` and it has `T: Deref<Target = impl Trait>` predicate from the parent `impl Struct`;
07659783fd/crates/hir-ty/src/lower.rs (L375-L399)
but as we can see above, lowering `TypeRef = impl Trait` doesn't take into account the parent generic parameters, so the `BoundVar` index here is `0`, as `fn foo` has no generic args other than parent's,
But this `BoundVar` is pointing at `'a` in `<'a, T: Deref<Target = impl Trait>>`.
So, in the first code reference `register_obligations_for_call`'s L:1948 - `.substitute(Interner, parameters)`, we are substituting `'a` with `Ty`, not `Lifetime` and this makes panic inside the chalk.
This PR fixes this wrong `BoundVar` index in such cases
Add scip/lsif flag to exclude vendored libaries
#17809 changed StaticIndex to include vendored libraries. This PR adds a flag to disable that behavior.
At work, our monorepo has too many rust targets to index all at once, so we split them up into several shards. Since all of our libraries are vendored, if rust-analyzer includes them, sharding no longer has much benefit, because every shard will have to index the entire transitive dependency graphs of all of its targets. We get around the issue presented in #17809 because some other shard will index the libraries directly.
fix: Properly account for editions in names
This PR touches a lot of parts. But the main changes are changing `hir_expand::Name` to be raw edition-dependently and only when necessary (unrelated to how the user originally wrote the identifier), and changing `is_keyword()` and `is_raw_identifier()` to be edition-aware (this was done in #17896, but the FIXMEs were fixed here).
It is possible that I missed some cases, but most IDE parts should properly escape (or not escape) identifiers now.
The rules of thumb are:
- If we show the identifier to the user, its rawness should be determined by the edition of the edited crate. This is nice for IDE features, but really important for changes we insert to the source code.
- For tests, I chose `Edition::CURRENT` (so we only have to (maybe) update tests when an edition becomes stable, to avoid churn).
- For debugging tools (helper methods and logs), I used `Edition::LATEST`.
Reviewing notes:
This is a really big PR but most of it is mechanical translation. I changed `Name` displayers to require an edition, and followed the compiler errors. Most methods just propagate the edition requirement. The interesting cases are mostly in `ide-assists`, as sometimes the correct crate to fetch the edition from requires awareness (there may be two). `ide-completions` and `ide-diagnostics` were solved pretty easily by introducing an edition field to their context. `ide` contains many features, for most of them it was propagated to the top level function and there the edition was fetched based on the file.
I also fixed all FIXMEs from #17896. Some required introducing an edition parameter (usually not for many methods after the changes to `Name`), some were changed to a new method `is_any_identifier()` because they really want any possible keyword.
Fixes#17895.
Fixes#17774.
This PR touches a lot of parts. But the main changes are changing
`hir_expand::Name` to be raw edition-dependently and only when necessary
(unrelated to how the user originally wrote the identifier),
and changing `is_keyword()` and `is_raw_identifier()` to be edition-aware
(this was done in #17896, but the FIXMEs were fixed here).
It is possible that I missed some cases, but most IDE parts should properly
escape (or not escape) identifiers now.
The rules of thumb are:
- If we show the identifier to the user, its rawness should be determined
by the edition of the edited crate. This is nice for IDE features,
but really important for changes we insert to the source code.
- For tests, I chose `Edition::CURRENT` (so we only have to (maybe) update
tests when an edition becomes stable, to avoid churn).
- For debugging tools (helper methods and logs), I used `Edition::LATEST`.
Allow flycheck process to exit gracefully
Assuming it isn't cancelled. Closes#17902.
The only place CommandHandle::join() is used is when the flycheck command
finishes, so this commit changes the behavior of the method itself.
The only reason I can see for the existing behavior is if the command is somehow holding onto a build lock longer than it should, this would force it to be released. But it would be a pretty heavy-handed way to solve that issue. I'm not aware of this occurring in practice.
Test for word boundary in `FindUsages`
This speeds up short identifiers search significantly, while unlikely to have an effect on long identifiers (the analysis takes much longer than some character comparison).
Tested by finding all references to `eq()` (from `PartialEq`) in the rust-analyzer repo. Total time went down from 100s to 10s (a 10x reduction!).
Feel free to close this if you consider this a non-issue, as most short identifiers are local.
internal: Replace once_cell with std's recently stabilized OnceCell/Lock and LazyCell/Lock
This doesn't get rid of the once_cell dependency, unfortunately, since we have dependencies that use it, but it's a nice to do cleanup. And when our deps will eventually get rid of once_cell we will get rid of it for free.
This speeds up short identifiers search significantly, while unlikely to have an effect on long identifiers (the analysis takes much longer than some character comparison).
Tested by finding all references to `eq()` (from `PartialEq`) in the rust-analyzer repo. Total time went down from 100s to 10s (a 10x reduction!).
This doesn't get rid of the once_cell dependency, unfortunately, since we have dependencies that use it, but it's a nice to do cleanup. And when our deps will eventually get rid of once_cell we will get rid of it for free.
Assuming it isn't cancelled. Closes#17902.
The only place CommandHandle::join is used is when the flycheck command
finishes, so this commit changes the behavior of the method itself.
fix: Panic while hovering associated function with type annotation on generic param that not inherited from its container type
Fixes#17871
We call `generic_args_sans_defaults` here;
64a140527b/crates/hir-ty/src/display.rs (L1021-L1034)
but the following substitution inside that function panic in #17871;
64a140527b/crates/hir-ty/src/display.rs (L1468)
it's because the `Binders.binder` inside `default_parameters` has a same length with the generics of the function we are hovering on, but the generics of it is split into two, `fn_params` and `parent_params`.
Because of this, it may panic if the function has one or more default parameters and both `fn_params` and `parent_params` are non-empty, like the case in the title of this PR.
So, we must call `generic_args_sans_default` first and then split it into `fn_params` and `parent_params`
fix: Panic while canonicalizing erroneous projection type
Fixes#17866
The root cause of #17866 is quite horrifyng 😨
```rust
trait T {
type A;
}
type Foo = <S as T>::A; // note that S isn't defined
fn main() {
Foo {}
}
```
While inferencing alias type `Foo = <S as T>::A`;
78c2bdce86/crates/hir-ty/src/infer.rs (L1388-L1398)
the error type `S` in it is substituted by inference var in L1396 above as below;
78c2bdce86/crates/hir-ty/src/infer/unify.rs (L866-L869)
This new inference var's index is `1`, as the type inferecing procedure here previously inserted another inference var into same `InferenceTable`.
But after that, the projection type made from the above then passed to the following function;
78c2bdce86/crates/hir-ty/src/traits.rs (L88-L96)
here, a whole new `InferenceTable` is made, without any inference var and in the L94, this table calls;
78c2bdce86/crates/hir-ty/src/infer/unify.rs (L364-L370)
And while registering `AliasEq` `obligation`, this obligation contains inference var `?1` made from the previous table, but this table has only one inference var `?0` made at L365.
So, the chalk panics when we try to canonicalize that obligation to register it, because the obligation contains an inference var `?1` that the canonicalizing table doesn't have.
Currently, we are calling `InferenceTable::new()` to do some normalizing, unifying or coercing things to some targets that might contain inference var that the new table doesn't have.
I think that this is quite dangerous footgun because the inference var is just an index that does not contain the information which table does it made from, so sometimes this "foreign" index might cause panic like this case, or point at the wrong variable.
This PR mitigates such behaviour simply by inserting sufficient number of inference vars to new table to avoid such problem.
This strategy doesn't harm current r-a's intention because the inference vars that passed into new tables are just "unresolved" variables in current r-a, so this is just making sure that such "unresolved" variables exist in the new table
internal: Be more resilient to bad language item definitions in binop inference
Fixes#16287Fixes#16286
There's one more in `write_fn_trait_method_resolution`, but I'm not sure if it won't cause further problems in `infer_closures`.
fix: Resolve included files to their calling modules in IDE layer
Fixes https://github.com/rust-lang/rust-analyzer/issues/17390 at the expense of reporting duplicate diagnostics for modules that have includes in them when both the calling and called file are included.
internal: Reply to requests with defaults when vfs is still loading
There is no reason for us to hit the database with queries when we certainly haven't reached a stable state yet. Instead we just reply with default request results until we are in a state where we can do meaningful work. This should save us from wasting resources while starting up at worst, and at best save us from creating query and interning entries that are non-meaningful which ultimately just end up wasting memory.
internal: Optimize the usage of channel senders
Used `Sender` directly instead of a boxed closure. There is no need to use the boxed closure. This also allows the caller to decide to do something other than `unwrap` (not a fan of it BTW).
