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Note: there was an existing code path involving `Interpolated` in
`MetaItem::from_tokens` that was dead. This commit transfers that to the
new form, but puts an `unreachable!` call inside it.
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This removes support for attributes on struct field rest patterns (the `..`) from the parser.
Previously they were being parsed but dropped from the AST, so didn't work and were deleted by rustfmt.
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Go over all structured parser suggestions and make them verbose style.
When suggesting to add or remove delimiters, turn them into multiple suggestion parts.
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This eliminates another `Option<AttrWrapper>` argument and changes one
obscure error message.
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r=davidtwco"
This reverts commit 57dad1d75e562ff73051c1c43b07eaf65c7dbd74, reversing
changes made to 36316df9fe6c3e246153fe6e78967643cf08c148.
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It can't use `maybe_whole`, but it can match `maybe_whole` more closely.
Also add a test for a case that wasn't previously covered.
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When encountering an attribute in a body, we try to recover from an
attribute on an expression (as opposed to a statement). We need to
properly clean up when the attribute is at the end of the body where a
tail expression would be.
Fix #118164.
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Co-authored-by: Adrian <adrian.iosdev@gmail.com>
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When encountering code that seems like it might be trying to have
multiple tail expressions depending on `cfg` information, suggest
alternatives that will success to parse.
```rust
fn foo() -> String {
#[cfg(feature = "validation")]
[1, 2, 3].iter().map(|c| c.to_string()).collect::<String>()
#[cfg(not(feature = "validation"))]
String::new()
}
```
```
error: expected `;`, found `#`
--> $DIR/multiple-tail-expr-behind-cfg.rs:5:64
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LL | #[cfg(feature = "validation")]
| ------------------------------ only `;` terminated statements or tail expressions are allowed after this attribute
LL | [1, 2, 3].iter().map(|c| c.to_string()).collect::<String>()
| ^ expected `;` here
LL | #[cfg(not(feature = "validation"))]
| - unexpected token
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help: add `;` here
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LL | [1, 2, 3].iter().map(|c| c.to_string()).collect::<String>();
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help: alternatively, consider surrounding the expression with a block
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LL | { [1, 2, 3].iter().map(|c| c.to_string()).collect::<String>() }
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help: it seems like you are trying to provide different expressions depending on `cfg`, consider using `if cfg!(..)`
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LL ~ if cfg!(feature = "validation") {
LL ~ [1, 2, 3].iter().map(|c| c.to_string()).collect::<String>()
LL ~ } else if cfg!(not(feature = "validation")) {
LL ~ String::new()
LL + }
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```
Fix #106020.
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