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resolve: Remove remaining special cases from built-in macros
Edition and definition sites of the macros are now also taken from the `#[rustc_builtin_macro]` definitions in `libcore`.
---
The edition switch may be a breaking change for `Rustc{Encodable,Decodable}` derives if they are used in combination with the unstable crate `serialize` from sysroot like this
```rust
extern crate serialize;
use serialize as rustc_serialize;
#[derive(RustcEncodable)]
struct S;
```
(see the updated `ui-fulldeps` tests).
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More explicit diagnostic when using a `vec![]` in a pattern
```
error: unexpected `(` after qualified path
--> $DIR/vec-macro-in-pattern.rs:3:14
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LL | Some(vec![x]) => (),
| ^^^^^^^
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| unexpected `(` after qualified path
| in this macro invocation
| use a slice pattern here instead
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= help: for more information, see https://doc.rust-lang.org/edition-guide/rust-2018/slice-patterns.html
= note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
```
Fix #61933.
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```
error: unexpected `(` after qualified path
--> $DIR/vec-macro-in-pattern.rs:3:14
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LL | Some(vec![x]) => (),
| ^^^^^^^
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| unexpected `(` after qualified path
| in this macro invocation
| use a slice pattern here instead
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= help: for more information, see https://doc.rust-lang.org/edition-guide/rust-2018/slice-patterns.html
= note: this warning originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
```
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Remove leftover AwaitOrigin
This was missed in PR #62293.
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Some more libsyntax::attr cleanup
Much smaller patch than the last one, mostly just finishing up by removing some Span arguments.
r? @petrochenkov
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This was missed in PR #62293.
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Move special treatment of `derive(Copy, PartialEq, Eq)` from expansion infrastructure to elsewhere
As described in https://github.com/rust-lang/rust/pull/62086#issuecomment-515195477.
Reminder:
- `derive(PartialEq, Eq)` makes the type it applied to a "structural match" type, so constants of this type can be used in patterns (and const generics in the future).
- `derive(Copy)` notifies other derives that the type it applied to implements `Copy`, so `derive(Clone)` can generate optimized code and other derives can generate code working with `packed` types and types with `rustc_layout_scalar_valid_range` attributes.
First, the special behavior is now enabled after properly resolving the derives, rather than after textually comparing them with `"Copy"`, `"PartialEq"` and `"Eq"` in `fn add_derived_markers`.
The markers are no longer kept as attributes in AST since derives cannot modify items and previously did it through hacks in the expansion infra.
Instead, the markers are now kept in a "global context" available from all the necessary places, namely - resolver.
For `derive(PartialEq, Eq)` the markers are created by the derive macros themselves and then consumed during HIR lowering to add the `#[structural_match]` attribute in HIR.
This is still a hack, but now it's a hack local to two specific macros rather than affecting the whole expansion infra.
Ideally we should find the way to put `#[structural_match]` on the impls rather than on the original item, and then consume it in `rustc_mir`, then no hacks in expansion and lowering will be required.
(I'll make an issue about this for someone else to solve, after this PR lands.)
The marker for `derive(Copy)` cannot be emitted by the `Copy` macro itself because we need to know it *before* the `Copy` macro is expanded for expanding other macros.
So we have to do it in resolve and block expansion of any derives in a `derive(...)` container until we know for sure whether this container has `Copy` in it or not.
Nasty stuff.
r? @eddyb or @matthewjasper
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Rename `ItemKind::Ty` to `ItemKind::TyAlias`
The current name is not entirely clear without context and `TyAlias` is consistent with `ItemKind::TraitAlias`.
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Point at type ascription before macro invocation on expansion parse error
Fix https://github.com/rust-lang/rust/issues/47666. Follow up to https://github.com/rust-lang/rust/pull/62791.
r? @petrochenkov
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infrastructure to elsewhere
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Cleanup syntax::attr
Mostly removing needless arguments to constructors
r? @petrochenkov
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Fix typo in Delimited::open_tt
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Change opaque type syntax from `existential type` to type alias `impl Trait`
This implements a new feature gate `type_alias_impl_trait` (this is slightly different from the originally proposed feature name, but matches what has been used in discussion since), deprecating the old `existential_types` feature.
The syntax for opaque types has been changed. In addition, the "existential" terminology has been replaced with "opaque", as per previous discussion and the RFC.
This makes partial progress towards implementing https://github.com/rust-lang/rust/issues/63063.
r? @Centril
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Pretty print attributes in `print_arg`
Fixes https://github.com/rust-lang/rust/issues/63210.
cc https://github.com/rust-lang/rust/issues/60406
r? @petrochenkov
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Unconfigure compiler unit test files during normal build
I haven't touched libstd though, it had a lot of tests and I'm not sure the people maintaining it want this.
Closes https://github.com/rust-lang/rust/issues/61097
r? @Mark-Simulacrum
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Fix ICE in #63135
Closes #63135.
r?@estebank
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Allow trailing comma in macro 2.0 declarations.
This should hopefully close #63102.
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Doc improvements
Miscellaneous documentation fixes.
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cleanup StringReader fields
reduce visibility and replace `Lrc<SourceFile>` with `start_pos`: the single bit we actually *need* from the file.
r? @petrochenkov
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Account for `maybe_whole_expr` in range patterns
Fixes https://github.com/rust-lang/rust/issues/63115 (fallout from https://github.com/rust-lang/rust/pull/62550).
r? @petrochenkov
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