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Merge Variant and Variant_
Extracted from #63468.
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Add NodeId for Arm, Field and FieldPat
Extracted from #63468
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expand: Unimplement `MutVisitor` on `MacroExpander`
Each call to `fully_expand_fragment` is something unique, interesting, and requiring attention.
It represents a "root" of expansion and its use means that something unusual is happening, like eager expansion or expansion performed outside of the primary expansion pass.
So, it shouldn't hide under a generic visitor call.
Also, from all the implemented visitor methods only two were actually used.
cc https://github.com/rust-lang/rust/pull/63468#discussion_r313504119
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syntax: Remove `DummyResult::expr_only`
The effect is that if a built-in macro both returns an erroneous AST fragment and is used in unexpected position, then the incorrect position error won't be reported.
This combination of two errors should be rare and isn't worth an extra field that makes people ask questions in comments.
(There wasn't even a test making sure it worked.)
Addresses https://github.com/rust-lang/rust/pull/63468#discussion_r313504644
r? @estebank
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libsyntax: cleanup and refactor `pat.rs`
A smaller refactoring & cleanup of `pat.rs` (best read commit by commit).
r? @petrochenkov
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Add lint for excess trailing semicolons
Closes #60876.
A caveat (not necessarily a negative, but something to consider) with this implementation is that excess semicolons after return/continue/break now also cause an 'unreachable statement' warning.
For the following example:
```
fn main() {
extra_semis();
}
fn extra_semis() -> i32 {
let mut sum = 0;;;
for i in 0..10 {
if i == 5 {
continue;;
} else if i == 9 {
break;;
} else {
sum += i;;
}
}
return sum;;
}
```
The output is:
```
warning: unnecessary trailing semicolons
--> src/main.rs:5:21
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5 | let mut sum = 0;;;
| ^^ help: remove these semicolons
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= note: `#[warn(redundant_semicolon)]` on by default
warning: unnecessary trailing semicolon
--> src/main.rs:8:22
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8 | continue;;
| ^ help: remove this semicolon
warning: unnecessary trailing semicolon
--> src/main.rs:10:19
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10 | break;;
| ^ help: remove this semicolon
warning: unnecessary trailing semicolon
--> src/main.rs:12:22
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12 | sum += i;;
| ^ help: remove this semicolon
warning: unnecessary trailing semicolon
--> src/main.rs:15:16
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15 | return sum;;
| ^ help: remove this semicolon
warning: unreachable statement
--> src/main.rs:8:22
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8 | continue;;
| ^
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= note: `#[warn(unreachable_code)]` on by default
warning: unreachable statement
--> src/main.rs:10:19
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10 | break;;
| ^
warning: unreachable statement
--> src/main.rs:15:16
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15 | return sum;;
| ^
```
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Fix typo in error message.
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Do not ICE when synthesizing spans falling inside unicode chars
Fix https://github.com/rust-lang/rust/issues/61226.
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Bring back suggestion for splitting `<-` into `< -`
Closes #62632
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syntax: account for CVarArgs being in the argument list.
Fixes #63430 by testing for `1` argument (the `CVarArgs` itself) instead of `0`.
Note that the error has basically been impossible to trigger since the change that caused #63430, so perhaps we need an audit of untested errors.
Also, this check probably belongs in AST validation/HIR lowering, but I'd rather fix it in place for now.
r? @petrochenkov cc @dlrobertson
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Each call to `fully_expand_fragment` is something unique, interesting, and requiring attention.
It represents a "root" of expansion and its use means that something unusual is happening, like eager expansion or expansion performed outside of the primary expansion pass.
So, it shouldn't be hide under a generic visitor call.
Also, from all the implemented visitor methods only two were actually used.
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Co-Authored-By: Mazdak Farrokhzad <twingoow@gmail.com>
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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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Closes #62632
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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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