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parser: add note for 'label expr.

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This commit is contained in:
Mazdak Farrokhzad 2020-03-07 09:41:12 +01:00
parent 83be689b94
commit 65b7ba5129
2 changed files with 13 additions and 0 deletions
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1
src/librustc_parse/parser/expr.rs
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@ -1121,6 +1121,7 @@ impl<'a> Parser<'a> {
": ".to_string(),
Applicability::MachineApplicable,
)
.note("labels are used before loops and blocks, allowing e.g., `break 'label` to them")
.emit();
}

12
src/test/ui/parser/labeled-no-colon-expr.stderr
View File

@ -6,6 +6,8 @@ LL | 'l0 while false {}
| | |
| | help: add `:` after the label
| the label
|
= note: labels are used before loops and blocks, allowing e.g., `break 'label` to them
error: labeled expression must be followed by `:`
--> $DIR/labeled-no-colon-expr.rs:5:5
@ -15,6 +17,8 @@ LL | 'l1 for _ in 0..1 {}
| | |
| | help: add `:` after the label
| the label
|
= note: labels are used before loops and blocks, allowing e.g., `break 'label` to them
error: labeled expression must be followed by `:`
--> $DIR/labeled-no-colon-expr.rs:6:5
@ -24,6 +28,8 @@ LL | 'l2 loop {}
| | |
| | help: add `:` after the label
| the label
|
= note: labels are used before loops and blocks, allowing e.g., `break 'label` to them
error: labeled expression must be followed by `:`
--> $DIR/labeled-no-colon-expr.rs:7:5
@ -33,6 +39,8 @@ LL | 'l3 {}
| | |
| | help: add `:` after the label
| the label
|
= note: labels are used before loops and blocks, allowing e.g., `break 'label` to them
error: expected `while`, `for`, `loop` or `{` after a label
--> $DIR/labeled-no-colon-expr.rs:8:9
@ -48,6 +56,8 @@ LL | 'l4 0;
| | |
| | help: add `:` after the label
| the label
|
= note: labels are used before loops and blocks, allowing e.g., `break 'label` to them
error: cannot use a `block` macro fragment here
--> $DIR/labeled-no-colon-expr.rs:13:17
@ -72,6 +82,8 @@ LL | 'l5 $b;
...
LL | m!({});
| ^^
|
= note: labels are used before loops and blocks, allowing e.g., `break 'label` to them
error: aborting due to 8 previous errors