8856: Use Chalk for unification r=flodiebold a=flodiebold
- use Chalk's unification, get rid of our own `unify`
- rewrite coercion to not use unification internals and to be more analogous to rustc
- fix various coercion bugs
- rewrite handling of obligations, since the old hacky optimization where we noted when an inference variable changes wasn't possible anymore
- stop trying to deeply resolve types all the time during inference, instead only do it shallowly where necessary
Co-authored-by: Florian Diebold <flodiebold@gmail.com>
We can't do the easy hack that we did before anymore, where we kept
track of whether any inference variables changed since the last time we
rechecked obligations. Instead, we store the obligations in
canonicalized form; that way we can easily check the inference variables
to see whether they have changed since the goal was canonicalized.
8873: Implement import-granularity guessing r=matklad a=Veykril
This renames our `MergeBehavior` to `ImportGranularity` as rustfmt has it as the purpose of them are basically the same. `ImportGranularity::Preserve` currently has no specific purpose for us as we don't have an organize imports assist yet, so it currently acts the same as `ImportGranularity::Item`.
We now try to guess the import style on a per file basis and fall back to the user granularity setting if the file has no specific style yet or where it is ambiguous. This can be turned off by setting `import.enforceGranularity` to `true`.
Closes https://github.com/rust-analyzer/rust-analyzer/issues/8870
Co-authored-by: Lukas Tobias Wirth <lukastw97@gmail.com>
8885: internal: greatly simplify eager macro representation r=jonas-schievink a=jonas-schievink
- Share structures with lazy macros, make both use `MacroCallLoc`.
- Remove `intern_eager_expansion`, `EagerCallLoc`, `EagerMacroId`, and *many* matches on `MacroCallId`.
- Make a lot of FIXMEs obsolete since the code no longer distinguishes between eager and lazy macros.
- Add `EagerCallInfo`, which is `Some` for calls to eager macros and holds the argument or expansion result and the included file.
8887: fix: fix derive collection after unresolved attribute fallback r=jonas-schievink a=jonas-schievink
Fixes https://github.com/rust-analyzer/rust-analyzer/pull/8882#issuecomment-844379170
bors r+
Co-authored-by: Jonas Schievink <jonasschievink@gmail.com>
8884: fix: add_explicit_type produces invalid code on `@` patterns r=Veykril a=iDawer
In
```rust
let name @ () = ();
```
an explicit type should be inserted after the pattern, not just after the name.
`let` statement defined as `LetStmt = Attr* 'let' Pat (':' Type)? '=' initializer:Expr ';'`
Co-authored-by: Dawer <7803845+iDawer@users.noreply.github.com>
