Deduplicate crates when extending crate graphs
This is quadratic in runtime per deduplication attempt, but I don't think that'll be a problem for the workload here. Don't be scared of the diff, the actual diff is +42 -22, the rest is tests and test data.
Fixes https://github.com/rust-lang/rust-analyzer/issues/14476
Handle dev-dependency cycles
cc https://github.com/rust-lang/rust-analyzer/issues/14167
This should fix cycles errors mostly (it fixes the one on rome/tools at least, but not on rustc. Though there it might just be because of rustc workspace being rustc workspace). Unfortunately this will effectively duplicate all crates currently, since if we want to be completely correct we'd need to set the test cfg for all dev dependencies and the transitive dependencies of those, something I worry we should try to avoid.
fix: Fix pat fragment handling in 2021 edition
Fixes https://github.com/rust-lang/rust-analyzer/issues/9055
The fix isn't that great, but we are kind of forced to do it the quick and hacky way right now since std has changed the `matches` macro to make use of this now. And for a proper fix we need to track hygiene for identifiers which is a long way off anyways
Register obligations during path inference
Fixes#14635
When we infer path expressions that resolve to some generic item, we need to consider their generic bounds. For example, when we resolve a path `Into::into` to `fn into<?0, ?1>` (note that `?0` is the self type of trait ref), we should register an obligation `?0: Into<?1>` or else their relationship would be lost.
Relevant part in rustc is [`add_required_obligations_with_code()`] that's called in [`instantiate_value_path()`].
[`instantiate_value_path()`]: 3462f79e94/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs (L1052)
[`add_required_obligations_with_code()`]: 3462f79e94/compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs (L1411)
doc(alias)-based completion round 2
Follow-up on #14433
We can now complete fields, functions and some use/mods.
Flyimports don't behave, I don't really have the time to understand the structure there either.
While reading the flyimport code, I removed one method only used there, the closure-tree was a bit confusing, I can revert that if you want.
Add syntax::make::ty_alias
There was until now no function that returns TypeAlias. This commit introduces a func that is fully compliant with the Rust Reference. I had problems working with Ident so for now the function uses simple string manipulation until ast_from_text function is called. I am however open to any ideas that could replace ident param in such a way that it accepts syntax::ast::Ident
