Handle trait alias definitions
Part of #2773
This PR adds a bunch of structs and enum variants for trait aliases. Trait aliases should be handled as an independent item because they are semantically distinct from traits.
I basically started by adding `TraitAlias{Id, Loc}` to `hir_def::item_tree` and iterated adding necessary stuffs until compiler stopped complaining what's missing. Let me know if there's still anything I need to add.
I'm opening up this PR for early review and stuff. I'm planning to add tests for IDE functionalities in this PR, but not type-related support, for which I put FIXME notes.
feat: allow `generate_function` to generate in different local crate
Closes#14224
This PR allows `generate_function` assist to generate in crates other than the current one. I took a step further from the original request and made it allow to generate in any local crates since it looked reasonable and IDE layer doesn't really know about packages.
(actually we have been checking which crate we're generating in only for methods and not for freestanding functions, so we were providing the assist for `std::foo$0()`; it's both feature and fix in a sense)
The first commit is a drive-by fix unrelated to the feature.
Don't drop rustc crates in the rustc workspace
Turns out the rustc workspace has tools that rely on the external crates themselves so this check is faulty
Fix associated item visibility in block-local impls
Fixes#14046
When we're resolving visibility of block-local items...
> `self` normally refers to the containing non-block module, and `super` to its parent (etc.). However, visibilities must only refer to a module in the DefMap they're written in, so we restrict them when that happens. ([link])
...unless we're resolving visibility of associated items in block-local impls, because that impl is semantically "hoisted" to the nearest (non-block) module. With this PR, we skip the adjustment for such items.
Since visibility representation of those items is modified, this PR also adjusts visibility rendering in `HirDisplay`.
[link]: a6603fc21d/crates/hir-def/src/nameres/path_resolution.rs (L101-L103)
Fix: Run doctests for structs with lifetime parameters from IDE
Fixes#14142: Doctests can't be triggered for structs with lifetimes
This MR adds lifetime parameters to the structs path for runnables so that they can be triggered from an IDE as well.
This is my first MR for rust-analyzer, please let me know if I should change something, either in code or the description here.
Beginning of MIR
This pull request introduces the initial implementation of MIR lowering and interpreting in Rust Analyzer.
The implementation of MIR has potential to bring several benefits:
- Executing a unit test without compiling it: This is my main goal. It can be useful for quickly testing code changes and print-debugging unit tests without the need for a full compilation (ideally in almost zero time, similar to languages like python and js). There is a probability that it goes nowhere, it might become slower than rustc, or it might need some unreasonable amount of memory, or we may fail to support a common pattern/function that make it unusable for most of the codes.
- Constant evaluation: MIR allows for easier and more correct constant evaluation, on par with rustc. If r-a wants to fully support the type system, it needs full const eval, which means arbitrary code execution, which needs MIR or something similar.
- Supporting more diagnostics: MIR can be used to detect errors, most famously borrow checker and lifetime errors, but also mutability errors and uninitialized variables, which can be difficult/impossible to detect in HIR.
- Lowering closures: With MIR we can find out closure capture modes, which is useful in detecting if a closure implements the `FnMut` or `Fn` traits, and calculating its size and data layout.
But the current PR implements no diagnostics and doesn't support closures. About const eval, I removed the old const eval code and it now uses the mir interpreter. Everything that is supported in stable rustc is either implemented or is super easy to implement. About interpreting unit tests, I added an experimental config, disabled by default, that shows a `pass` or `fail` on hover of unit tests (ideally it should be a button similar to `Run test` button, but I didn't figured out how to add them). Currently, no real world test works, due to missing features including closures, heap allocation, `dyn Trait` and ... so at this point it is only useful for me selecting what to implement next.
The implementation of MIR is based on the design of rustc, the data structures are almost copy paste (so it should be easy to migrate it to a possible future stable-mir), but the lowering and interpreting code is from me.
add: clean api to get `raw_ptr` type
There doesn't seem to be an API to fetch the type of `raw_ptr`, which is helpful for a project I work on.
Notes:
- I am unsure about the function name, do let me know if I should use something else.
- Also unsure about where to add tests, for hir changes. Will fix it as needed.
fix:add a case in which remainig is None in resolveing types when resolving hir path.
fix#14030 The variable type is being determined incorrectly
This PR fixed a problem in which `go to definition` is jumping to the incorrect position because it was failing to resolve the type in case it defined in the module when resolving hir.
In addition, I added a test for this issue and refactored the related code.
This is my first PR and I am using a translation tool to write this text. Let me know if you have any problems.
Respect $CARGO_HOME when looking up toolchains.
Some people set `$CARGO_HOME` to a location other than `~/.cargo` (`$XDG_DATA_DIR/cargo`, in my case), and I'd be a little nicer if the rust-analyzer extension and server respect that value when looking up toolchains, instead of having us configure all of `$CARGO`, `$RUSTC` ... manually.
The new implementation still defaults to `~/.cargo` if `$CARGO_HOME` is unset, pretty much like cargo itself does (as documented in https://doc.rust-lang.org/cargo/guide/cargo-home.html), so the change is backwards compatible for most people except those who has configured `$CARGO_HOME` explicitly.
I considered using https://crates.io/crates/home as suggested by https://doc.rust-lang.org/cargo/guide/cargo-home.html, but decided to put int on hold because i) we need mirror impl in node, ii) I thought the consistency matters more and iii) the new implementation shouldn't be worse than the current one (i.e. switching to `home` improvement is rather orthogonal and could be done in another PR). If you have any directions on this, please let me know.
fix: Add check for extra path segments after a fully qualified one
`type A = <()>;` is parsed just fine by rust-analyzer, but then rejected by rustc:
```
error: expected `::`, found `;`
--> x.rs:7:14
|
7 | type A = <()>;
| ^ expected `::`
```
Fixed by adding a lookahead for the `::` token after fully-qualified path segments.
minor: import `Either` from `either`
This is a clean-up patch to replace `use itertools::Either` with `use either::Either` for the sake of consistency.
