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.
31 lines
1.0 KiB
Plaintext
31 lines
1.0 KiB
Plaintext
error: unconstrained generic constant
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--> $DIR/array-trait.rs:23:23
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LL | pub struct T<S: Simd>([S::Lane; S::SIZE]);
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| ^^^^^^^^^^^^^^^^^^
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help: try adding a `where` bound
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LL | pub struct T<S: Simd>([S::Lane; S::SIZE]) where [(); S::SIZE]:;
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| ++++++++++++++++++++
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error[E0077]: SIMD vector element type should be a primitive scalar (integer/float/pointer) type
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--> $DIR/array-trait.rs:23:1
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LL | pub struct T<S: Simd>([S::Lane; S::SIZE]);
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| ^^^^^^^^^^^^^^^^^^^^^
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error: unconstrained generic constant
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--> $DIR/array-trait.rs:23:23
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LL | #[derive(Copy, Clone)]
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| ----- in this derive macro expansion
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LL | pub struct T<S: Simd>([S::Lane; S::SIZE]);
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| ^^^^^^^^^^^^^^^^^^
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= note: this error originates in the derive macro `Clone` (in Nightly builds, run with -Z macro-backtrace for more info)
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error: aborting due to 3 previous errors
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For more information about this error, try `rustc --explain E0077`.
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