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Pretty print empty blocks as {}
**Example:**
```rust
macro_rules! p {
($e:expr) => {
println!("{}", stringify!($e));
};
($i:item) => {
println!("{}", stringify!($i));
};
}
fn main() {
p!(if true {});
p!(struct S {});
}
```
**Before:**
```console
if true { }
struct S {
}
```
**After:**
```console
if true {}
struct S {}
```
This affects [`dbg!`](https://doc.rust-lang.org/std/macro.dbg.html), as well as ecosystem uses of stringify such as in [`anyhow::ensure!`](https://docs.rs/anyhow/1/anyhow/macro.ensure.html). Printing a `{ }` in today's heavily rustfmt'd world comes out looking jarring/sloppy.
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And stop creating a fake `mod` item for the crate root when expanding a crate.
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Allow multiple clobber_abi in asm
Update docs
Fix aarch64 test
Combine abis
Emit duplicate ABI error, empty ABI list error
multiple clobber_abi
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more clippy fixes
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TraitKind -> Trait
TyAliasKind -> TyAlias
ImplKind -> Impl
FnKind -> Fn
All `*Kind`s in AST are supposed to be enums.
Tuple structs are converted to braced structs for the types above, and fields are reordered in syntactic order.
Also, mutable AST visitor now correctly visit spans in defaultness, unsafety, impl polarity and constness.
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This reverts commit 059b68dd677808e14e560802d235ad40beeba71e.
Note that this was manually adjusted to retain some of the refactoring
introduced by commit 059b68dd677808e14e560802d235ad40beeba71e, so that it could
likewise retain the correction introduced in commit
5b4bc05fa57be19bb5962f4b7c0f165e194e3151
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This reverts commit 5b4bc05fa57be19bb5962f4b7c0f165e194e3151.
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Cow'ify some pprust methods
Reduce number of potential needless de/allocations by using `Cow<'static, str>` instead of explicit `String` type.
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reduce potential reallocations
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to an empty vec![]
slightly reduces code bloat
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For example, this code:
$arg:expr
used to be pretty-printed as:
$ arg : expr
but is now pretty-printed as:
$arg : expr
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fix pretty print for `loop`
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Add a "raw" option for asm! which ignores format string specifiers
This is useful when including raw assembly snippets using `include_str!`.
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r=nikomatsakis
Re-add support for parsing (and pretty-printing) inner-attributes in match body
Re-add support for parsing (and pretty-printing) inner-attributes within body of a `match`.
In other words, we can do `match EXPR { #![inner_attr] ARM_1 ARM_2 ... }` again.
I believe this unbreaks the only four crates that crater flagged as broken by PR #83312.
(I am putting this up so that the lang-team can check it out and decide whether it changes their mind about what to do regarding PR #83312.)
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position.
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Add unnamed_fields feature gate and gate unnamed fields on parsing
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In addition to making the output look nicer for all crates, this also
aligns the pretty-printing output with what the `rental` crate expects.
This will allow us to eventually disable a backwards-compat hack in a
follow-up PR.
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On x86, the default syntax is also switched to Intel to match asm!
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body of a `match`.
In other words, we can do `match EXPR { #![inner_attr] ARM_1 ARM_2 ... }` again.
I believe this unbreaks the only four crates that crater flagged as broken by PR 83312.
(I am putting this up so that the lang-team can check it out and decide whether
it changes their mind about what to do regarding PR 83312.)
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Found with https://github.com/est31/warnalyzer.
Dubious changes:
- Is anyone else using rustc_apfloat? I feel weird completely deleting
x87 support.
- Maybe some of the dead code in rustc_data_structures, in case someone
wants to use it in the future?
- Don't change rustc_serialize
I plan to scrap most of the json module in the near future (see
https://github.com/rust-lang/compiler-team/issues/418) and fixing the
tests needed more work than I expected.
TODO: check if any of the comments on the deleted code should be kept.
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A bunch of nits fixed, and a new test for pretty printing the AST.
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This currently creates a field which is always false on GenericParamDefKind for future use when
consts are permitted to have defaults
Update const_generics:default locations
Previously just ignored them, now actually do something about them.
Fix using type check instead of value
Add parsing
This adds all the necessary changes to lower const-generics defaults from parsing.
Change P<Expr> to AnonConst
This matches the arguments passed to instantiations of const generics, and makes it specific to
just anonymous constants.
Attempt to fix lowering bugs
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StructField -> FieldDef ("field definition")
Field -> ExprField ("expression field", not "field expression")
FieldPat -> PatField ("pattern field", not "field pattern")
Also rename visiting and other methods working on them.
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ast: Keep expansion status for out-of-line module items
I.e. whether a module `mod foo;` is already loaded from a file or not.
This is a pre-requisite to correctly treating inner attributes on such modules (https://github.com/rust-lang/rust/issues/81661).
With this change AST structures for `mod` items diverge even more for AST structure for the crate root, which previously used `ast::Mod`.
Therefore this PR removes `ast::Mod` from `ast::Crate` in the first commit, these two things are sufficiently different from each other, at least at syntactic level.
Customization points for visiting a "`mod` item or crate root" were also removed from AST visitors (`fn visit_mod`).
`ast::Mod` itself was refactored away in the second commit in favor of `ItemKind::Mod(Unsafe, ModKind)`.
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Ensure valid TraitRefs are created for GATs
This fixes `ProjectionTy::trait_ref` to use the correct substs. Places that need all of the substs have been updated to not use `trait_ref`.
r? ````@jackh726````
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Also remove `ast::Mod` which is mostly redundant now
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Crate root is sufficiently different from `mod` items, at least at syntactic level.
Also remove customization point for "`mod` item or crate root" from AST visitors.
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If we already have a slice, there is no need to get another full-range slice from that, just use the original.
clippy::redundant_slicing
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