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.
20 lines
497 B
Plaintext
20 lines
497 B
Plaintext
error: unconstrained generic constant
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--> $DIR/variance-associated-consts.rs:14:12
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LL | field: [u8; <T as Trait>::Const]
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| ^^^^^^^^^^^^^^^^^^^^^^^^^
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help: try adding a `where` bound
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LL | struct Foo<T: Trait> where [(); <T as Trait>::Const]: {
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| ++++++++++++++++++++++++++++++++
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error: [o]
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--> $DIR/variance-associated-consts.rs:13:1
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LL | struct Foo<T: Trait> {
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| ^^^^^^^^^^^^^^^^^^^^
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error: aborting due to 2 previous errors
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