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.
73 lines
2.6 KiB
Plaintext
73 lines
2.6 KiB
Plaintext
error: unconstrained generic constant
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--> $DIR/cross_crate_predicate.rs:7:44
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LL | let _ = const_evaluatable_lib::test1::<T>();
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| ^
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note: required by a bound in `test1`
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--> $DIR/auxiliary/const_evaluatable_lib.rs:5:10
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LL | pub fn test1<T>() -> [u8; std::mem::size_of::<T>() - 1]
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| ----- required by a bound in this function
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LL | where
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LL | [u8; std::mem::size_of::<T>() - 1]: Sized,
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `test1`
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help: try adding a `where` bound
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LL | fn user<T>() where [(); std::mem::size_of::<T>() - 1]: {
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| +++++++++++++++++++++++++++++++++++++++++
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error: unconstrained generic constant
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--> $DIR/cross_crate_predicate.rs:7:44
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LL | let _ = const_evaluatable_lib::test1::<T>();
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| ^
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note: required by a bound in `test1`
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--> $DIR/auxiliary/const_evaluatable_lib.rs:3:27
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LL | pub fn test1<T>() -> [u8; std::mem::size_of::<T>() - 1]
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `test1`
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help: try adding a `where` bound
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LL | fn user<T>() where [(); std::mem::size_of::<T>() - 1]: {
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| +++++++++++++++++++++++++++++++++++++++++
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error: unconstrained generic constant
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--> $DIR/cross_crate_predicate.rs:7:13
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LL | let _ = const_evaluatable_lib::test1::<T>();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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note: required by a bound in `test1`
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--> $DIR/auxiliary/const_evaluatable_lib.rs:5:10
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LL | pub fn test1<T>() -> [u8; std::mem::size_of::<T>() - 1]
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| ----- required by a bound in this function
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LL | where
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LL | [u8; std::mem::size_of::<T>() - 1]: Sized,
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `test1`
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help: try adding a `where` bound
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LL | fn user<T>() where [(); std::mem::size_of::<T>() - 1]: {
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| +++++++++++++++++++++++++++++++++++++++++
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error: unconstrained generic constant
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--> $DIR/cross_crate_predicate.rs:7:13
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LL | let _ = const_evaluatable_lib::test1::<T>();
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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note: required by a bound in `test1`
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--> $DIR/auxiliary/const_evaluatable_lib.rs:3:27
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LL | pub fn test1<T>() -> [u8; std::mem::size_of::<T>() - 1]
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `test1`
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help: try adding a `where` bound
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LL | fn user<T>() where [(); std::mem::size_of::<T>() - 1]: {
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| +++++++++++++++++++++++++++++++++++++++++
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error: aborting due to 4 previous errors
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