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.
14 lines
548 B
Plaintext
14 lines
548 B
Plaintext
error: unconstrained generic constant
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--> $DIR/issue-51892.rs:14:17
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LL | type Type = [u8; std::mem::size_of::<<T as Trait>::Type>()];
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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help: try adding a `where` bound
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LL | type Type = [u8; std::mem::size_of::<<T as Trait>::Type>()] where [(); std::mem::size_of::<<T as Trait>::Type>()]:;
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| ++++++++++++++++++++++++++++++++++++++++++++++++++++++
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error: aborting due to 1 previous error
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