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.
36 lines
1.1 KiB
Plaintext
36 lines
1.1 KiB
Plaintext
error[E0308]: mismatched types
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--> $DIR/issue-62504.rs:18:21
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LL | ArrayHolder([0; Self::SIZE])
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| ^^^^^^^^^^^^^^^ expected `X`, found `Self::SIZE`
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= note: expected constant `X`
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found constant `Self::SIZE`
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error: unconstrained generic constant
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--> $DIR/issue-62504.rs:18:25
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LL | ArrayHolder([0; Self::SIZE])
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| ^^^^^^^^^^
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help: try adding a `where` bound
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LL | pub const fn new() -> Self where [(); Self::SIZE]: {
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| +++++++++++++++++++++++
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error[E0282]: type annotations needed for `ArrayHolder<X>`
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--> $DIR/issue-62504.rs:26:9
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LL | let mut array = ArrayHolder::new();
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| ^^^^^^^^^
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help: consider giving `array` an explicit type, where the value of const parameter `X` is specified
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LL | let mut array: ArrayHolder<X> = ArrayHolder::new();
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| ++++++++++++++++
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error: aborting due to 3 previous errors
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Some errors have detailed explanations: E0282, E0308.
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For more information about an error, try `rustc --explain E0282`.
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