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rust/tests/ui/const-generics/generic_const_exprs/abstract-const-as-cast-3.stderr
Esteban Küber 6b24fdf811 Provide structured suggestion for unconstrained generic constant 
```
error: unconstrained generic constant
  --> $DIR/const-argument-if-length.rs:18:10
   |
LL |     pad: [u8; is_zst::<T>()],
   |          ^^^^^^^^^^^^^^^^^^^
   |
help: try adding a `where` bound
   |
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
  |
6 |     bb::<{!N}>();
  |          ^^^^
-Ztrack-diagnostics: created at compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs:3539:36
  |
help: try adding a `where` bound
  |
5 | fn b<const N: bool>() where [(); {!N} as usize]: {
  |                       ++++++++++++++++++++++++++
```

Fix #122395.
2024-03-21 00:03:59 +00:00

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error: unconstrained generic constant
--> $DIR/abstract-const-as-cast-3.rs:17:19
|
LL | assert_impl::<HasCastInTraitImpl<{ N + 1 }, { N as u128 }>>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: required for `HasCastInTraitImpl<{ N + 1 }, { N as u128 }>` to implement `Trait`
--> $DIR/abstract-const-as-cast-3.rs:8:22
|
LL | impl<const O: usize> Trait for HasCastInTraitImpl<O, { O as u128 }> {}
| ^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: required by a bound in `use_trait_impl::assert_impl`
--> $DIR/abstract-const-as-cast-3.rs:14:23
|
LL | fn assert_impl<T: Trait>() {}
| ^^^^^ required by this bound in `assert_impl`
help: try adding a `where` bound
|
LL | EvaluatableU128<{N as u128}>:, [(); { O as u128 } as usize]: {
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
error[E0308]: mismatched types
--> $DIR/abstract-const-as-cast-3.rs:17:5
|
LL | assert_impl::<HasCastInTraitImpl<{ N + 1 }, { N as u128 }>>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `{ N as u128 }`, found `{ O as u128 }`
|
= note: expected constant `{ N as u128 }`
found constant `{ O as u128 }`
note: required by a bound in `use_trait_impl::assert_impl`
--> $DIR/abstract-const-as-cast-3.rs:14:23
|
LL | fn assert_impl<T: Trait>() {}
| ^^^^^ required by this bound in `assert_impl`
error: unconstrained generic constant
--> $DIR/abstract-const-as-cast-3.rs:20:19
|
LL | assert_impl::<HasCastInTraitImpl<{ N + 1 }, { N as _ }>>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: required for `HasCastInTraitImpl<{ N + 1 }, { N as _ }>` to implement `Trait`
--> $DIR/abstract-const-as-cast-3.rs:8:22
|
LL | impl<const O: usize> Trait for HasCastInTraitImpl<O, { O as u128 }> {}
| ^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: required by a bound in `use_trait_impl::assert_impl`
--> $DIR/abstract-const-as-cast-3.rs:14:23
|
LL | fn assert_impl<T: Trait>() {}
| ^^^^^ required by this bound in `assert_impl`
help: try adding a `where` bound
|
LL | EvaluatableU128<{N as u128}>:, [(); { O as u128 } as usize]: {
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
error[E0308]: mismatched types
--> $DIR/abstract-const-as-cast-3.rs:20:5
|
LL | assert_impl::<HasCastInTraitImpl<{ N + 1 }, { N as _ }>>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `{ N as _ }`, found `{ O as u128 }`
|
= note: expected constant `{ N as _ }`
found constant `{ O as u128 }`
note: required by a bound in `use_trait_impl::assert_impl`
--> $DIR/abstract-const-as-cast-3.rs:14:23
|
LL | fn assert_impl<T: Trait>() {}
| ^^^^^ required by this bound in `assert_impl`
error[E0308]: mismatched types
--> $DIR/abstract-const-as-cast-3.rs:23:5
|
LL | assert_impl::<HasCastInTraitImpl<13, { 12 as u128 }>>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `12`, found `13`
|
= note: expected constant `12`
found constant `13`
note: required by a bound in `use_trait_impl::assert_impl`
--> $DIR/abstract-const-as-cast-3.rs:14:23
|
LL | fn assert_impl<T: Trait>() {}
| ^^^^^ required by this bound in `assert_impl`
error[E0308]: mismatched types
--> $DIR/abstract-const-as-cast-3.rs:25:5
|
LL | assert_impl::<HasCastInTraitImpl<14, 13>>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `13`, found `14`
|
= note: expected constant `13`
found constant `14`
note: required by a bound in `use_trait_impl::assert_impl`
--> $DIR/abstract-const-as-cast-3.rs:14:23
|
LL | fn assert_impl<T: Trait>() {}
| ^^^^^ required by this bound in `assert_impl`
error: unconstrained generic constant
--> $DIR/abstract-const-as-cast-3.rs:35:19
|
LL | assert_impl::<HasCastInTraitImpl<{ N + 1 }, { N as u128 }>>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: required for `HasCastInTraitImpl<{ N + 1 }, { N as u128 }>` to implement `Trait`
--> $DIR/abstract-const-as-cast-3.rs:8:22
|
LL | impl<const O: usize> Trait for HasCastInTraitImpl<O, { O as u128 }> {}
| ^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: required by a bound in `use_trait_impl_2::assert_impl`
--> $DIR/abstract-const-as-cast-3.rs:32:23
|
LL | fn assert_impl<T: Trait>() {}
| ^^^^^ required by this bound in `assert_impl`
help: try adding a `where` bound
|
LL | EvaluatableU128<{N as _}>:, [(); { O as u128 } as usize]: {
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
error[E0308]: mismatched types
--> $DIR/abstract-const-as-cast-3.rs:35:5
|
LL | assert_impl::<HasCastInTraitImpl<{ N + 1 }, { N as u128 }>>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `{ N as u128 }`, found `{ O as u128 }`
|
= note: expected constant `{ N as u128 }`
found constant `{ O as u128 }`
note: required by a bound in `use_trait_impl_2::assert_impl`
--> $DIR/abstract-const-as-cast-3.rs:32:23
|
LL | fn assert_impl<T: Trait>() {}
| ^^^^^ required by this bound in `assert_impl`
error: unconstrained generic constant
--> $DIR/abstract-const-as-cast-3.rs:38:19
|
LL | assert_impl::<HasCastInTraitImpl<{ N + 1 }, { N as _ }>>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
note: required for `HasCastInTraitImpl<{ N + 1 }, { N as _ }>` to implement `Trait`
--> $DIR/abstract-const-as-cast-3.rs:8:22
|
LL | impl<const O: usize> Trait for HasCastInTraitImpl<O, { O as u128 }> {}
| ^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
note: required by a bound in `use_trait_impl_2::assert_impl`
--> $DIR/abstract-const-as-cast-3.rs:32:23
|
LL | fn assert_impl<T: Trait>() {}
| ^^^^^ required by this bound in `assert_impl`
help: try adding a `where` bound
|
LL | EvaluatableU128<{N as _}>:, [(); { O as u128 } as usize]: {
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
error[E0308]: mismatched types
--> $DIR/abstract-const-as-cast-3.rs:38:5
|
LL | assert_impl::<HasCastInTraitImpl<{ N + 1 }, { N as _ }>>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `{ N as _ }`, found `{ O as u128 }`
|
= note: expected constant `{ N as _ }`
found constant `{ O as u128 }`
note: required by a bound in `use_trait_impl_2::assert_impl`
--> $DIR/abstract-const-as-cast-3.rs:32:23
|
LL | fn assert_impl<T: Trait>() {}
| ^^^^^ required by this bound in `assert_impl`
error[E0308]: mismatched types
--> $DIR/abstract-const-as-cast-3.rs:41:5
|
LL | assert_impl::<HasCastInTraitImpl<13, { 12 as u128 }>>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `12`, found `13`
|
= note: expected constant `12`
found constant `13`
note: required by a bound in `use_trait_impl_2::assert_impl`
--> $DIR/abstract-const-as-cast-3.rs:32:23
|
LL | fn assert_impl<T: Trait>() {}
| ^^^^^ required by this bound in `assert_impl`
error[E0308]: mismatched types
--> $DIR/abstract-const-as-cast-3.rs:43:5
|
LL | assert_impl::<HasCastInTraitImpl<14, 13>>();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `13`, found `14`
|
= note: expected constant `13`
found constant `14`
note: required by a bound in `use_trait_impl_2::assert_impl`
--> $DIR/abstract-const-as-cast-3.rs:32:23
|
LL | fn assert_impl<T: Trait>() {}
| ^^^^^ required by this bound in `assert_impl`
error: aborting due to 12 previous errors
For more information about this error, try `rustc --explain E0308`.
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