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Add errors for unknown, stable and duplicate feature attributes
- Adds an error for unknown (lang and lib) features.
- Extends the lint for unnecessary feature attributes for stable features to libs features (this already exists for lang features).
- Adds an error for duplicate (lang and lib) features.
```rust
#![feature(fake_feature)] //~ ERROR unknown feature `fake_feature`
#![feature(i128_type)] //~ WARNING the feature `i128_type` has been stable since 1.26.0
#![feature(non_exhaustive)]
#![feature(non_exhaustive)] //~ ERROR duplicate `non_exhaustive` feature attribute
```
Fixes #52053, fixes #53032 and address some of the problems noted in #44232 (though not unused features).
There are a few outstanding problems, that I haven't narrowed down yet:
- [x] Stability attributes on macros do not seem to be taken into account.
- [x] Stability attributes behind `cfg` attributes are not taken into account.
- [x] There are failing incremental tests.
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Fix ICE when rustdoc encounters certain usages of HRTBs
Fixes #51236
Under certain circumstances, `AutoTraitFinder` could end up computing a `ParamEnv` involving two trait predicates that differed only in the region parameters involved. One of these parameters would be a HRTB, while the other would be a normal region parameter.
When this `ParamEnv` was later passed to `SelectionContext`, an `Ambiguity` error would occur, since the erased versions of these predicates would be identical. To solve the issue, we de-duplicate our list of predicates as we build it up. Whenever we encounter two predicates that differ only in their assignment of region parameters (a HRTB vs a normal lifetime parameter), we pick the HRTB. This corresponds to selecting a 'stricter' bound to display in the generated documentation: we're requiring that a particular type works for all possible lifetime parameters if it's going to implement a particular auto trait.
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make `everybody_loops` preserve item declarations
First half of https://github.com/rust-lang/rust/issues/52545.
`everybody_loops` is used by rustdoc to ensure we don't contain erroneous references to platform APIs if one of its uses is pulled in by `#[doc(cfg)]`. However, you can also implement traits for public types inside of functions. This is used by Diesel (probably others, but they were the example that was reported) to get around a recent macro hygiene fix, which has caused their crate to fail to document. While this won't make the traits show up in documentation (that step comes later), it will at least allow files to be generated.
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Fixes #51236
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GuillaumeGomez:intra_doc_link_resolution_failure-documented, r=QuietMisdreavus
Add "self" intra-link support
Fixes #49583.
r? @QuietMisdreavus
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r=QuietMisdreavus
Pass edition flags to compiler from rustdoc as expected
Fixes #52357.
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r=QuietMisdreavus
Prevent some markdown transformation on short docblocks
Before:
<img width="1440" alt="screen shot 2018-06-28 at 01 46 01" src="https://user-images.githubusercontent.com/3050060/42005762-7d533bbe-7a76-11e8-8361-027886803399.png">
After:
<img width="1440" alt="screen shot 2018-06-28 at 01 46 02" src="https://user-images.githubusercontent.com/3050060/42005768-81bd59a0-7a76-11e8-819b-9b4be72579d6.png">
This is only performed on short doc blocks, not on plain ones. Not all transformations are prevented (you still have a few like urls, code blocks, etc...).
cc @nical
r? @QuietMisdreavus
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hey look, macros properly link to the right place now
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r=petrochenkov
refactor: create multiple HIR items for imports
When lowering `use` statements into HIR, they get a `Def` of the thing they're pointing at. This is great for things that need to know what was just pulled into scope. However, this is a bit misleading, because a `use` statement can pull things from multiple namespaces if their names collide. This is a problem for rustdoc, because if there are a module and a function with the same name (for example) then it will only document the module import, because that's that the lowered `use` statement points to.
The current version of this PR does the following:
* Whenever the resolver comes across a `use` statement, it loads the definitions into a new `import_map` instead of the existing `def_map`. This keeps the resolutions per-namespace so that all the target definitions are available.
* When lowering `use` statements, it looks up the resolutions in the `import_map` and creates multiple `Item`s if there is more than one resolution.
* To ensure the `NodeId`s are properly tracked in the lowered module, they need to be created in the AST, and pulled out as needed if multiple resolutions are available.
Fixes https://github.com/rust-lang/rust/issues/34843
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Add lint for intra link resolution failure
This PR is almost done, just remains this note:
```
note: requested on the command line with `-W intra-link-resolution-failure`
```
I have no idea why my lint is considered as being passed through command line and wasn't able to find where it was set. If anyone has an idea, it'd be very helpful!
cc @QuietMisdreavus
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r=QuietMisdreavus
Fix crate-name option in rustdoc
Fixes #51229.
r? @QuietMisdreavus
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r=QuietMisdreavus
Add attributes for trait and methods as well
Fixes #48485.
r? @QuietMisdreavus
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This avoids a full compiler build in order to build and/or run tests for
rustdoc.
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rustdoc: hide macro export statements from docs
As mentioned in https://github.com/rust-lang/rust/issues/50647, rustdoc now prints both the import statement and the macro itself when re-exporting macros. This is a stopgap solution to clean up the std docs and get something small backported into beta.
What this does: When rustdoc finds an export statement for a macro, instead of printing the export and bailing, now it will instead hide the export and bail. Until we can solve https://github.com/rust-lang/rust/issues/34843 or have a better way to find the attributes on an export statement when inlining macros, this will at least match the current behavior and clean up the re-export statements from the docs.
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add auto-impl for primitive type
Part of #50431.
I have no clue how to test this though with the rustdoc test suite...
r? @QuietMisdreavus
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