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.
23 lines
800 B
Plaintext
23 lines
800 B
Plaintext
error: unconstrained generic constant
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--> $DIR/array-size-in-generic-struct-param.rs:8:38
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LL | struct ArithArrayLen<const N: usize>([u32; 0 + N]);
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| ^^^^^^^^^^^^
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help: try adding a `where` bound
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LL | struct ArithArrayLen<const N: usize>([u32; 0 + N]) where [(); 0 + N]:;
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| ++++++++++++++++++
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error: overly complex generic constant
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--> $DIR/array-size-in-generic-struct-param.rs:23:15
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LL | arr: [u8; CFG.arr_size],
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| ^^^^^^^^^^^^ field access is not supported in generic constants
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= help: consider moving this anonymous constant into a `const` function
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= note: this operation may be supported in the future
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error: aborting due to 2 previous errors
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