mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-24 07:44:10 +00:00
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.
36 lines
1.4 KiB
Plaintext
36 lines
1.4 KiB
Plaintext
error: unconstrained generic constant
|
|
--> $DIR/abstract-const-as-cast-2.rs:7:25
|
|
|
|
|
LL | struct Foo<const N: u8>([u8; N as usize])
|
|
| ^^^^^^^^^^^^^^^^
|
|
|
|
|
help: try adding a `where` bound
|
|
|
|
|
LL | Evaluatable<{N as u128}>:, [(); N as usize]:;
|
|
| +++++++++++++++++++
|
|
|
|
error: unconstrained generic constant
|
|
--> $DIR/abstract-const-as-cast-2.rs:13:26
|
|
|
|
|
LL | struct Foo2<const N: u8>(Evaluatable::<{N as u128}>) where Evaluatable<{N as usize as u128 }>:;
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
help: try adding a `where` bound
|
|
|
|
|
LL | struct Foo2<const N: u8>(Evaluatable::<{N as u128}>) where Evaluatable<{N as usize as u128 }>:, [(); {N as u128} as usize]:;
|
|
| +++++++++++++++++++++++++++++
|
|
|
|
error: unconstrained generic constant
|
|
--> $DIR/abstract-const-as-cast-2.rs:17:25
|
|
|
|
|
LL | struct Bar<const N: u8>([u8; (N + 2) as usize]) where [(); (N + 1) as usize]:;
|
|
| ^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
help: try adding a `where` bound
|
|
|
|
|
LL | struct Bar<const N: u8>([u8; (N + 2) as usize]) where [(); (N + 1) as usize]:, [(); (N + 2) as usize]:;
|
|
| +++++++++++++++++++++++++
|
|
|
|
error: aborting due to 3 previous errors
|
|
|