Resolves 5011
Tuple structs with visibility modifiers and comments before the first
field were incorrectly formatted. Comments would duplicate part of the
visibility modifier and struct name.
When trying to parse the tuple fields the ``items::Context`` searches
for the opening '(', but because the visibility modifier introduces
another '(' -- for example ``pub(crate)`` -- the parsing gets messed up.
Now the span is adjusted to start after the struct identifier, or after
any generics. Adjusting the span in this way ensures that the
``items::Contex`` will correctly find the tuple fields.
rustfmt should only support rewriting a struct in an expression
position with alignment (non-default behavior) when there is no rest
(with or without a base) and all of the fields are non-shorthand.
Servo has used this since forever, and it'd be useful to be able to use
rustfmt stable there so that we can use the same rustfmt version in
both Firefox and Servo.
Feel free to close this if there's any reason it shouldn't be done.
Fixes 4984
When parsing derive attributes we're only concerned about the traits
and comments listed between the opening and closing parentheses.
Derive attribute spans currently start at the '#'.
Span starts here
|
v
#[derive(...)]
After this update the derive spans start after the opening '('.
Span starts here
|
V
#[derive(...)]
Revert anon union parsing
Revert PR #84571 and #85515, which implemented anonymous union parsing in a manner that broke the context-sensitivity for the `union` keyword and thus broke stable Rust code.
Fix#88583.
This is a copy of #4296 with these changes:
* file is not reopened again to find if the file is generated
* first five lines are scanned for `@generated` marker instead of one
* no attempt is made to only search for marker in comments
`@generated` marker is used by certain tools to understand that the
file is generated, so it should be treated differently than a file
written by a human:
* linters should not be invoked on these files,
* diffs in these files are less important,
* and these files should not be reformatted.
This PR proposes builtin support for `@generated` marker.
I have not found a standard for a generated file marker, but:
* Facebook [uses `@generated` marker](https://tinyurl.com/fb-generated)
* Phabricator tool which was spawned from Facebook internal tool
[also understands `@generated` marker](https://git.io/JnVHa)
* Cargo inserts `@generated` marker into [generated Cargo.lock files](https://git.io/JnVHP)
My personal story is that rust-protobuf project which I maintain
was broken twice because of incompatibilities/bugs in rustfmt marker
handling: [one](https://github.com/stepancheg/rust-protobuf/issues/493),
[two](https://github.com/stepancheg/rust-protobuf/issues/551).
(Also, rust-protobuf started generating `@generated` marker
[6 years ago](https://git.io/JnV5h)).
While rustfmt AST markers are useful to apply to a certain AST
elements, disable whole-file-at-once all-tools-at-once text level
marker might be easier to use and more reliable for generated code.
Encode spans relative to the enclosing item
The aim of this PR is to avoid recomputing queries when code is moved without modification.
MCP at https://github.com/rust-lang/compiler-team/issues/443
This is achieved by :
1. storing the HIR owner LocalDefId information inside the span;
2. encoding and decoding spans relative to the enclosing item in the incremental on-disk cache;
3. marking a dependency to the `source_span(LocalDefId)` query when we translate a span from the short (`Span`) representation to its explicit (`SpanData`) representation.
Since all client code uses `Span`, step 3 ensures that all manipulations
of span byte positions actually create the dependency edge between
the caller and the `source_span(LocalDefId)`.
This query return the actual absolute span of the parent item.
As a consequence, any source code motion that changes the absolute byte position of a node will either:
- modify the distance to the parent's beginning, so change the relative span's hash;
- dirty `source_span`, and trigger the incremental recomputation of all code that
depends on the span's absolute byte position.
With this scheme, I believe the dependency tracking to be accurate.
For the moment, the spans are marked during lowering.
I'd rather do this during def-collection,
but the AST MutVisitor is not practical enough just yet.
The only difference is that we attach macro-expanded spans
to their expansion point instead of the macro itself.
Added test covering this. Chose to treat the code block
as rust if and only if all of the comma-separated attributes
are rust-valid. Chose to allow/preserve whitespace around commas
Fixes#3158
- [x] Removed `?const` and change uses of `?const`
- [x] Added `~const` to the AST. It is gated behind const_trait_impl.
- [x] Validate `~const` in ast_validation.
- [ ] Add enum `BoundConstness` to the HIR. (With variants `NotConst` and
`ConstIfConst` allowing future extensions)
- [ ] Adjust trait selection and pre-existing code to use `BoundConstness`.
- [ ] Optional steps (*for this PR, obviously*)
- [ ] Fix#88155
- [ ] Do something with constness bounds in chalk
