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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.
24 lines
1 KiB
Plaintext
24 lines
1 KiB
Plaintext
error[E0599]: no function or associated item named `assert` found for struct `Bool<{ std::mem::needs_drop::<T>() }>` in the current scope
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--> $DIR/const-needs_drop-monomorphic.rs:11:46
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LL | struct Bool<const B: bool> {}
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| -------------------------- function or associated item `assert` not found for this struct
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...
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LL | Bool::<{ std::mem::needs_drop::<T>() }>::assert();
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| ^^^^^^ function or associated item cannot be called on `Bool<{ std::mem::needs_drop::<T>() }>` due to unsatisfied trait bounds
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error: unconstrained generic constant
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--> $DIR/const-needs_drop-monomorphic.rs:11:5
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LL | Bool::<{ std::mem::needs_drop::<T>() }>::assert();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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help: try adding a `where` bound
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LL | fn f<T>() where [(); { std::mem::needs_drop::<T>() } as usize]: {
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| +++++++++++++++++++++++++++++++++++++++++++++++++++++
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error: aborting due to 2 previous errors
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For more information about this error, try `rustc --explain E0599`.
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