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Suggest a FnPtr type if a FnDef type is found

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This commit is contained in:
Fabian Wolff 2021-06-11 20:12:40 +02:00
parent f687d5c43a
commit 79dc9a76a6
3 changed files with 74 additions and 39 deletions
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14
src/test/ui/suggestions/unnamable-types.rs
View file

@ -13,21 +13,27 @@ static B: _ = "abc";
//~| HELP: replace with the correct type
// FIXME: this should also suggest a function pointer, as the closure is non-capturing
const C: _ = || 42;
//~^ ERROR: the type placeholder `_` is not allowed within types on item signatures
//~| NOTE: not allowed in type signatures
//~| NOTE: however, the inferred type
struct S<T> { t: T }
const D = S { t: || -> i32 { 42 } };
const D = S { t: { let i = 0; move || -> i32 { i } } };
//~^ ERROR: missing type for `const` item
//~| NOTE: however, the inferred type
fn foo() -> i32 { 42 }
const E = S { t: foo };
const E = foo;
//~^ ERROR: missing type for `const` item
//~| NOTE: however, the inferred type
//~| HELP: provide a type for the item
const F = S { t: foo };
//~^ ERROR: missing type for `const` item
//~| HELP: provide a type for the item
const F = || -> i32 { yield 0; return 1; };
const G = || -> i32 { yield 0; return 1; };
//~^ ERROR: missing type for `const` item
//~| NOTE: however, the inferred type

48
src/test/ui/suggestions/unnamable-types.stderr
View file

@ -14,53 +14,53 @@ LL | static B: _ = "abc";
| help: replace with the correct type: `&str`
error[E0121]: the type placeholder `_` is not allowed within types on item signatures
--> $DIR/unnamable-types.rs:16:10
--> $DIR/unnamable-types.rs:17:10
|
LL | const C: _ = || 42;
| ^ not allowed in type signatures
|
note: however, the inferred type `[closure@$DIR/unnamable-types.rs:16:14: 16:19]` cannot be named
--> $DIR/unnamable-types.rs:16:14
note: however, the inferred type `[closure@$DIR/unnamable-types.rs:17:14: 17:19]` cannot be named
--> $DIR/unnamable-types.rs:17:14
|
LL | const C: _ = || 42;
| ^^^^^
error: missing type for `const` item
--> $DIR/unnamable-types.rs:22:7
--> $DIR/unnamable-types.rs:23:7
|
LL | const D = S { t: || -> i32 { 42 } };
LL | const D = S { t: { let i = 0; move || -> i32 { i } } };
| ^
|
note: however, the inferred type `S<[closure@$DIR/unnamable-types.rs:22:18: 22:34]>` cannot be named
--> $DIR/unnamable-types.rs:22:11
note: however, the inferred type `S<[closure@$DIR/unnamable-types.rs:23:31: 23:51]>` cannot be named
--> $DIR/unnamable-types.rs:23:11
|
LL | const D = S { t: || -> i32 { 42 } };
| ^^^^^^^^^^^^^^^^^^^^^^^^^
LL | const D = S { t: { let i = 0; move || -> i32 { i } } };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: missing type for `const` item
--> $DIR/unnamable-types.rs:27:7
--> $DIR/unnamable-types.rs:29:7
|
LL | const E = S { t: foo };
| ^
|
note: however, the inferred type `S<fn() -> i32 {foo}>` cannot be named
--> $DIR/unnamable-types.rs:27:11
|
LL | const E = S { t: foo };
| ^^^^^^^^^^^^
LL | const E = foo;
| ^ help: provide a type for the item: `E: fn() -> i32`
error: missing type for `const` item
--> $DIR/unnamable-types.rs:31:7
--> $DIR/unnamable-types.rs:32:7
|
LL | const F = || -> i32 { yield 0; return 1; };
LL | const F = S { t: foo };
| ^ help: provide a type for the item: `F: S<fn() -> i32>`
error: missing type for `const` item
--> $DIR/unnamable-types.rs:37:7
|
LL | const G = || -> i32 { yield 0; return 1; };
| ^
|
note: however, the inferred type `[generator@$DIR/unnamable-types.rs:31:11: 31:43 {i32, ()}]` cannot be named
--> $DIR/unnamable-types.rs:31:11
note: however, the inferred type `[generator@$DIR/unnamable-types.rs:37:11: 37:43 {i32, ()}]` cannot be named
--> $DIR/unnamable-types.rs:37:11
|
LL | const F = || -> i32 { yield 0; return 1; };
LL | const G = || -> i32 { yield 0; return 1; };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 6 previous errors
error: aborting due to 7 previous errors
For more information about this error, try `rustc --explain E0121`.