6b24fdf811
```
error: unconstrained generic constant
--> $DIR/const-argument-if-length.rs:18:10
|
LL | pad: [u8; is_zst::<T>()],
| ^^^^^^^^^^^^^^^^^^^
|
help: try adding a `where` bound
|
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
|
6 | bb::<{!N}>();
| ^^^^
-Ztrack-diagnostics: created at compiler/rustc_trait_selection/src/traits/error_reporting/type_err_ctxt_ext.rs:3539:36
|
help: try adding a `where` bound
|
5 | fn b<const N: bool>() where [(); {!N} as usize]: {
| ++++++++++++++++++++++++++
```
Fix #122395.
24 lines
1.0 KiB
Plaintext
24 lines
1.0 KiB
Plaintext
error[E0599]: no function or associated item named `assert` found for struct `Bool<{ std::mem::needs_drop::<T>() }>` in the current scope
|
|
--> $DIR/const-needs_drop-monomorphic.rs:11:46
|
|
|
|
|
LL | struct Bool<const B: bool> {}
|
|
| -------------------------- function or associated item `assert` not found for this struct
|
|
...
|
|
LL | Bool::<{ std::mem::needs_drop::<T>() }>::assert();
|
|
| ^^^^^^ function or associated item cannot be called on `Bool<{ std::mem::needs_drop::<T>() }>` due to unsatisfied trait bounds
|
|
|
|
error: unconstrained generic constant
|
|
--> $DIR/const-needs_drop-monomorphic.rs:11:5
|
|
|
|
|
LL | Bool::<{ std::mem::needs_drop::<T>() }>::assert();
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
help: try adding a `where` bound
|
|
|
|
|
LL | fn f<T>() where [(); { std::mem::needs_drop::<T>() } as usize]: {
|
|
| +++++++++++++++++++++++++++++++++++++++++++++++++++++
|
|
|
|
error: aborting due to 2 previous errors
|
|
|
|
For more information about this error, try `rustc --explain E0599`.
|