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This reverts commit 65cd843ae06ad00123c131a431ed5304e4cd577a, reversing
changes made to d255c6a57c393db6221b1ff700daea478436f1cd.
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This improves parallel rustc parallelism by avoiding the bottleneck after each individual `par_body_owners` (because it needs to wait for queries to finish, so if there is one long running one, a lot of cores will be idle while waiting for the single query).
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Update tests
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When encountering a bare assignment in a let-chain, suggest turning the
assignment into a `let` expression or an equality check.
```
error: expected expression, found `let` statement
--> $DIR/bad-if-let-suggestion.rs:5:8
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LL | if let x = 1 && i = 2 {}
| ^^^^^^^^^
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= note: only supported directly in conditions of `if` and `while` expressions
help: you might have meant to continue the let-chain
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LL | if let x = 1 && let i = 2 {}
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help: you might have meant to compare for equality
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LL | if let x = 1 && i == 2 {}
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```
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Co-authored-by: Adrian <adrian.iosdev@gmail.com>
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Detect if there is a potential typo where the `{` meant to open the
closure body was written before the body.
```
error[E0277]: expected a `FnOnce<({integer},)>` closure, found `Option<usize>`
--> $DIR/ruby_style_closure_successful_parse.rs:3:31
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LL | let p = Some(45).and_then({|x|
| ______________________--------_^
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| | required by a bound introduced by this call
LL | | 1 + 1;
LL | | Some(x * 2)
| | ----------- this tail expression is of type `Option<usize>`
LL | | });
| |_____^ expected an `FnOnce<({integer},)>` closure, found `Option<usize>`
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= help: the trait `FnOnce<({integer},)>` is not implemented for `Option<usize>`
note: required by a bound in `Option::<T>::and_then`
--> $SRC_DIR/core/src/option.rs:LL:COL
help: you might have meant to open the closure body instead of placing a closure within a block
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LL - let p = Some(45).and_then({|x|
LL + let p = Some(45).and_then(|x| {
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```
Detect the potential typo where the closure header is missing.
```
error[E0277]: expected a `FnOnce<(&bool,)>` closure, found `bool`
--> $DIR/block_instead_of_closure_in_arg.rs:3:23
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LL | Some(true).filter({
| _________________------_^
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| | required by a bound introduced by this call
LL | |/ if number % 2 == 0 {
LL | || number == 0
LL | || } else {
LL | || number != 0
LL | || }
| ||_________- this tail expression is of type `bool`
LL | | });
| |______^ expected an `FnOnce<(&bool,)>` closure, found `bool`
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= help: the trait `for<'a> FnOnce<(&'a bool,)>` is not implemented for `bool`
note: required by a bound in `Option::<T>::filter`
--> $SRC_DIR/core/src/option.rs:LL:COL
help: you might have meant to create the closure instead of a block
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LL | Some(true).filter(|_| {
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```
Partially address #27300.
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When parsing a closure without a body that is surrounded by a block,
suggest moving the opening brace after the closure head.
Fix #116608.
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- Add doc comment to new type
- Restore "only supported directly in conditions of `if` and `while` expressions" note
- Rename variant with clearer name
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Previously some invalid let expressions would result in both a feature
error and a parsing error. Avoid this and ensure that we only emit the
parsing error when this happens.
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There was an incomplete version of the check in parsing and a second
version in AST validation. This meant that some, but not all, invalid
uses were allowed inside macros/disabled cfgs. It also means that later
passes have a hard time knowing when the let expression is in a valid
location, sometimes causing ICEs.
- Add a field to ExprKind::Let in AST/HIR to mark whether it's in a
valid location.
- Suppress later errors and MIR construction for invalid let
expressions.
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We currently provide wrong suggestions and unhelpful errors on closure
bodies with braces missing. For example, given the following code:
```
fn main() {
let _x = Box::new(|x|x+1;);
}
```
the current output is like this:
```
error: expected expression, found `)`
--> ./main.rs:2:30
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2 | let _x = Box::new(|x|x+1;);
| ^ expected expression
error: closure bodies that contain statements must be surrounded by braces
--> ./main.rs:2:25
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2 | let _x = Box::new(|x|x+1;);
| ^
3 | }
| ^
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...
help: try adding braces
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2 ~ let _x = Box::new(|x| {x+1;);
3 ~ }}
...
error: expected `;`, found `}`
--> ./main.rs:2:32
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2 | let _x = Box::new(|x|x+1;);
| ^ help: add `;` here
3 | }
| - unexpected token
error: aborting due to 3 previous errors
```
This commit allows outputting correct suggestions and errors. The above
code would output like this:
```
error: closure bodies that contain statements must be surrounded by braces
--> ./main.rs:2:25
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2 | let _x = Box::new(|x|x+1;);
| ^ ^
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note: statement found outside of a block
--> ./main.rs:2:29
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2 | let _x = Box::new(|x|x+1;);
| ---^ this `;` turns the preceding closure into a statement
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| this expression is a statement because of the trailing semicolon
note: the closure body may be incorrectly delimited
--> ./main.rs:2:23
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2 | let _x = Box::new(|x|x+1;);
| ^^^^^^ - ...but likely you meant the closure to end here
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| this is the parsed closure...
help: try adding braces
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2 | let _x = Box::new(|x| {x+1;});
| + +
error: aborting due to previous error
```
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