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
742 B
Plaintext
24 lines
742 B
Plaintext
error[E0308]: mismatched types
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--> $DIR/different-fn.rs:10:5
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LL | [0; size_of::<Foo<T>>()]
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| ^^^^^^^^^^^^^^^^^^^^^^^^ expected `size_of::<T>()`, found `size_of::<Foo<T>>()`
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= note: expected constant `size_of::<T>()`
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found constant `size_of::<Foo<T>>()`
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error: unconstrained generic constant
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--> $DIR/different-fn.rs:10:9
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LL | [0; size_of::<Foo<T>>()]
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| ^^^^^^^^^^^^^^^^^^^
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help: try adding a `where` bound
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LL | fn test<T>() -> [u8; size_of::<T>()] where [(); size_of::<Foo<T>>()]: {
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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 E0308`.
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