6b24fdf811
```
error: unconstrained generic constant
--> $DIR/const-argument-if-length.rs:18:10
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LL | pad: [u8; is_zst::<T>()],
| ^^^^^^^^^^^^^^^^^^^
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help: try adding a `where` bound
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LL | pub struct AtLeastByte<T: ?Sized> where [(); is_zst::<T>()]: {
| ++++++++++++++++++++++++++
```
Detect when the constant expression isn't `usize` and suggest casting:
```
error: unconstrained generic constant
--> f300.rs:6:10
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6 | bb::<{!N}>();
| ^^^^
-Ztrack-diagnostics: created at compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs:3539:36
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help: try adding a `where` bound
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5 | fn b<const N: bool>() where [(); {!N} as usize]: {
| ++++++++++++++++++++++++++
```
Fix #122395.
73 lines
3.0 KiB
Plaintext
73 lines
3.0 KiB
Plaintext
error[E0277]: the trait bound `(): _Contains<&C>` is not satisfied
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--> $DIR/issue-85848.rs:24:29
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LL | writes_to_specific_path(&cap);
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| ----------------------- ^^^^ the trait `_Contains<&C>` is not implemented for `()`, which is required by `&C: Delegates<()>`
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| |
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| required by a bound introduced by this call
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help: this trait has no implementations, consider adding one
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--> $DIR/issue-85848.rs:4:1
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LL | trait _Contains<T> {
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| ^^^^^^^^^^^^^^^^^^
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note: required for `&C` to implement `Contains<(), true>`
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--> $DIR/issue-85848.rs:21:12
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LL | impl<T, U> Contains<T, { contains::<T, U>() }> for U where T: _Contains<U> {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^ ------------ unsatisfied trait bound introduced here
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note: required for `&C` to implement `Delegates<()>`
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--> $DIR/issue-85848.rs:12:12
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LL | impl<T, U> Delegates<U> for T where T: Contains<U, true> {}
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| ^^^^^^^^^^^^ ^ ----------------- unsatisfied trait bound introduced here
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note: required by a bound in `writes_to_specific_path`
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--> $DIR/issue-85848.rs:30:31
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LL | fn writes_to_specific_path<C: Delegates<()>>(cap: &C) {}
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| ^^^^^^^^^^^^^ required by this bound in `writes_to_specific_path`
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error: unconstrained generic constant
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--> $DIR/issue-85848.rs:24:29
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LL | writes_to_specific_path(&cap);
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| ----------------------- ^^^^
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| |
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| required by a bound introduced by this call
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note: required for `&C` to implement `Contains<(), true>`
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--> $DIR/issue-85848.rs:21:12
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LL | impl<T, U> Contains<T, { contains::<T, U>() }> for U where T: _Contains<U> {}
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| ^^^^^^^^^^^^----------------------^ ^
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| unsatisfied trait bound introduced here
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note: required for `&C` to implement `Delegates<()>`
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--> $DIR/issue-85848.rs:12:12
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LL | impl<T, U> Delegates<U> for T where T: Contains<U, true> {}
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| ^^^^^^^^^^^^ ^ ----------------- unsatisfied trait bound introduced here
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note: required by a bound in `writes_to_specific_path`
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--> $DIR/issue-85848.rs:30:31
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LL | fn writes_to_specific_path<C: Delegates<()>>(cap: &C) {}
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| ^^^^^^^^^^^^^ required by this bound in `writes_to_specific_path`
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help: try adding a `where` bound
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LL | fn writes_to_path<C>(cap: &C) where [(); { contains::<T, U>() } as usize]: {
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| ++++++++++++++++++++++++++++++++++++++++++++
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error[E0308]: mismatched types
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--> $DIR/issue-85848.rs:24:5
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LL | writes_to_specific_path(&cap);
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `true`, found `{ contains::<T, U>() }`
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= note: expected constant `true`
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found constant `{ contains::<T, U>() }`
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error: aborting due to 3 previous errors
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Some errors have detailed explanations: E0277, E0308.
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For more information about an error, try `rustc --explain E0277`.
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