3c0f019b3c
improve tip for inaccessible traits
Improve the tips when the candidate method is from an inaccessible trait.
For example:
```rs
mod m {
trait Trait {
fn f() {}
}
impl<T> Trait for T {}
}
fn main() {
struct S;
S::f();
}
```
The difference between before and now is:
```diff
error[E0599]: no function or associated item named `f` found for struct `S` in the current scope
--> ./src/main.rs:88:6
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LL | struct S;
| -------- function or associated item `f` not found for this struct
LL | S::f();
| ^ function or associated item not found in `S`
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= help: items from traits can only be used if the trait is implemented and in scope
- help: trait `Trait` which provides `f` is implemented but not in scope; perhaps you want to import it
+ help: trait `crate:Ⓜ️:Trait` which provides `f` is implemented but not reachable
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- LL + use crate:Ⓜ️:Trait;
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```
208 lines
6.4 KiB
Plaintext
208 lines
6.4 KiB
Plaintext
error[E0599]: no method named `a` found for struct `S` in the current scope
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--> $DIR/item-privacy.rs:67:7
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LL | struct S;
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| -------- method `a` not found for this struct
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...
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LL | S.a();
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| ^
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= help: items from traits can only be used if the trait is implemented and in scope
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= help: trait `method::A` which provides `a` is implemented but not reachable
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help: there is a method `b` with a similar name
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LL | S.b();
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| ~
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error[E0599]: no method named `b` found for struct `S` in the current scope
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--> $DIR/item-privacy.rs:68:7
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LL | struct S;
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| -------- method `b` not found for this struct
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...
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LL | fn b(&self) { }
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| - the method is available for `S` here
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...
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LL | S.b();
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| ^
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= help: items from traits can only be used if the trait is in scope
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help: trait `B` which provides `b` is implemented but not in scope; perhaps you want to import it
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LL + use method::B;
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help: there is a method `c` with a similar name
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LL | S.c();
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| ~
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error[E0624]: method `a` is private
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--> $DIR/item-privacy.rs:72:7
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LL | fn a(&self) { }
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| ----------- private method defined here
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...
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LL | c.a();
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| ^ private method
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error[E0599]: no function or associated item named `a` found for struct `S` in the current scope
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--> $DIR/item-privacy.rs:78:8
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LL | struct S;
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| -------- function or associated item `a` not found for this struct
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...
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LL | S::a(&S);
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| ^ function or associated item not found in `S`
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= help: items from traits can only be used if the trait is implemented and in scope
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= help: trait `method::A` which provides `a` is implemented but not reachable
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help: there is an associated constant `B` with a similar name
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--> $DIR/item-privacy.rs:29:9
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LL | const B: u8 = 0;
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| ^^^^^^^^^^^
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error[E0599]: no function or associated item named `b` found for struct `S` in the current scope
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--> $DIR/item-privacy.rs:80:8
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LL | struct S;
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| -------- function or associated item `b` not found for this struct
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...
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LL | S::b(&S);
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| ^ function or associated item not found in `S`
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= help: items from traits can only be used if the trait is in scope
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help: there is an associated constant `B` with a similar name
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--> $DIR/item-privacy.rs:29:9
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LL | const B: u8 = 0;
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| ^^^^^^^^^^^
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help: trait `B` which provides `b` is implemented but not in scope; perhaps you want to import it
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LL + use method::B;
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error[E0624]: method `a` is private
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--> $DIR/item-privacy.rs:84:14
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LL | fn a(&self) { }
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| ----------- private method defined here
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...
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LL | <dyn C>::a(&S);
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| ^ private method
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error[E0599]: no associated item named `A` found for struct `S` in the current scope
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--> $DIR/item-privacy.rs:97:8
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LL | struct S;
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| -------- associated item `A` not found for this struct
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...
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LL | S::A;
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| ^ associated item not found in `S`
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= help: items from traits can only be used if the trait is implemented and in scope
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= help: trait `assoc_const::A` which provides `A` is implemented but not reachable
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help: there is an associated constant `B` with a similar name
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LL | S::B;
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| ~
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error[E0599]: no associated item named `B` found for struct `S` in the current scope
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--> $DIR/item-privacy.rs:98:8
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LL | struct S;
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| -------- associated item `B` not found for this struct
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...
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LL | S::B;
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| ^ associated item not found in `S`
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= help: items from traits can only be used if the trait is in scope
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help: there is a method `b` with a similar name
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--> $DIR/item-privacy.rs:11:9
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LL | fn b(&self) { }
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| ^^^^^^^^^^^
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help: trait `B` which provides `B` is implemented but not in scope; perhaps you want to import it
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LL + use assoc_const::B;
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error[E0624]: associated constant `A` is private
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--> $DIR/item-privacy.rs:101:14
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LL | const A: u8 = 0;
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| ----------- private associated constant defined here
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...
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LL | <dyn C>::A;
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| ^ private associated constant
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error[E0038]: the trait `assoc_const::C` cannot be made into an object
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--> $DIR/item-privacy.rs:101:6
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LL | <dyn C>::A;
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| ^^^^^ `assoc_const::C` cannot be made into an object
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note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
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--> $DIR/item-privacy.rs:25:15
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LL | const A: u8 = 0;
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| ^ ...because it contains this associated `const`
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...
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LL | const B: u8 = 0;
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| ^ ...because it contains this associated `const`
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...
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LL | pub trait C: A + B {
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| - this trait cannot be made into an object...
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LL | const C: u8 = 0;
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| ^ ...because it contains this associated `const`
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= help: consider moving `C` to another trait
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= help: consider moving `A` to another trait
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= help: consider moving `B` to another trait
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= help: only type `S` implements the trait, consider using it directly instead
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error[E0223]: ambiguous associated type
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--> $DIR/item-privacy.rs:115:12
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LL | let _: S::A;
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| ^^^^
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help: if there were a trait named `Example` with associated type `A` implemented for `S`, you could use the fully-qualified path
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LL | let _: <S as Example>::A;
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| ~~~~~~~~~~~~~~~~~
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error[E0223]: ambiguous associated type
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--> $DIR/item-privacy.rs:116:12
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LL | let _: S::B;
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| ^^^^ help: use fully-qualified syntax: `<S as assoc_ty::B>::B`
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error[E0223]: ambiguous associated type
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--> $DIR/item-privacy.rs:117:12
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LL | let _: S::C;
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| ^^^^ help: use fully-qualified syntax: `<S as assoc_ty::C>::C`
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error[E0624]: associated type `A` is private
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--> $DIR/item-privacy.rs:119:12
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LL | type A = u8;
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| ------ the associated type is defined here
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...
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LL | let _: T::A;
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| ^^^^ private associated type
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error[E0624]: associated type `A` is private
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--> $DIR/item-privacy.rs:128:9
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LL | type A = u8;
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| ------ the associated type is defined here
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...
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LL | A = u8,
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| ^^^^^^ private associated type
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error: aborting due to 15 previous errors
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Some errors have detailed explanations: E0038, E0223, E0599, E0624.
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For more information about an error, try `rustc --explain E0038`.
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