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remove a type string comparison

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This commit is contained in:
Takayuki Maeda 2022-08-10 11:42:46 +09:00
parent 93ab13b4e8
commit 54cf66f241
3 changed files with 77 additions and 8 deletions
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7
src/test/ui/suggestions/as-ref.rs
View file

@ -17,4 +17,11 @@ fn main() {
// note: do not suggest because of `E: usize`
let x: &Result<usize, usize> = &Ok(3);
let y: Result<&usize, usize> = x; //~ ERROR mismatched types [E0308]
let multiple_ref_opt = &&Some(Foo);
multiple_ref_opt.map(|arg| takes_ref(arg)); //~ ERROR mismatched types [E0308]
multiple_ref_opt.and_then(|arg| Some(takes_ref(arg))); //~ ERROR mismatched types [E0308]
let multiple_ref_result = &&Ok(Foo);
multiple_ref_result.map(|arg| takes_ref(arg)); //~ ERROR mismatched types [E0308]
multiple_ref_result.and_then(|arg| Ok(takes_ref(arg))); //~ ERROR mismatched types [E0308]
}

62
src/test/ui/suggestions/as-ref.stderr
View file

@ -97,6 +97,66 @@ LL | let y: Result<&usize, usize> = x;
= note: expected enum `Result<&usize, usize>`
found reference `&Result<usize, usize>`
error: aborting due to 7 previous errors
error[E0308]: mismatched types
--> $DIR/as-ref.rs:22:42
|
LL | multiple_ref_opt.map(|arg| takes_ref(arg));
| --- --------- ^^^ expected `&Foo`, found struct `Foo`
| | |
| | arguments to this function are incorrect
| help: consider using `as_ref` instead: `as_ref().map`
|
note: function defined here
--> $DIR/as-ref.rs:3:4
|
LL | fn takes_ref(_: &Foo) {}
| ^^^^^^^^^ -------
error[E0308]: mismatched types
--> $DIR/as-ref.rs:23:52
|
LL | multiple_ref_opt.and_then(|arg| Some(takes_ref(arg)));
| -------- --------- ^^^ expected `&Foo`, found struct `Foo`
| | |
| | arguments to this function are incorrect
| help: consider using `as_ref` instead: `as_ref().and_then`
|
note: function defined here
--> $DIR/as-ref.rs:3:4
|
LL | fn takes_ref(_: &Foo) {}
| ^^^^^^^^^ -------
error[E0308]: mismatched types
--> $DIR/as-ref.rs:25:45
|
LL | multiple_ref_result.map(|arg| takes_ref(arg));
| --- --------- ^^^ expected `&Foo`, found struct `Foo`
| | |
| | arguments to this function are incorrect
| help: consider using `as_ref` instead: `as_ref().map`
|
note: function defined here
--> $DIR/as-ref.rs:3:4
|
LL | fn takes_ref(_: &Foo) {}
| ^^^^^^^^^ -------
error[E0308]: mismatched types
--> $DIR/as-ref.rs:26:53
|
LL | multiple_ref_result.and_then(|arg| Ok(takes_ref(arg)));
| -------- --------- ^^^ expected `&Foo`, found struct `Foo`
| | |
| | arguments to this function are incorrect
| help: consider using `as_ref` instead: `as_ref().and_then`
|
note: function defined here
--> $DIR/as-ref.rs:3:4
|
LL | fn takes_ref(_: &Foo) {}
| ^^^^^^^^^ -------
error: aborting due to 11 previous errors
For more information about this error, try `rustc --explain E0308`.