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6b24fdf811
```
error: unconstrained generic constant
--> $DIR/const-argument-if-length.rs:18:10
|
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
|
help: try adding a `where` bound
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5 | fn b<const N: bool>() where [(); {!N} as usize]: {
| ++++++++++++++++++++++++++
```
Fix #122395.
25 lines
953 B
Plaintext
25 lines
953 B
Plaintext
error: unconstrained generic constant
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--> $DIR/generic-expr-default.rs:5:54
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LL | pub fn needs_evaluatable_bound<const N1: usize>() -> Foo<N1> {
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| ^^^^^^^
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help: try adding a `where` bound
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LL | pub fn needs_evaluatable_bound<const N1: usize>() -> Foo<N1> where [(); { N + 1 }]: {
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| ++++++++++++++++++++++
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error: unconstrained generic constant
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--> $DIR/generic-expr-default.rs:14:58
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LL | fn needs_evaluatable_bound_alias<T, const N: usize>() -> FooAlias<N>
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| ^^^^^^^^^^^
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help: try adding a `where` bound
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LL | fn needs_evaluatable_bound_alias<T, const N: usize>() -> FooAlias<N> where [(); { N + 1 }]:
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| ++++++++++++++++++++++
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error: aborting due to 2 previous errors
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