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.
41 lines
1.4 KiB
Plaintext
41 lines
1.4 KiB
Plaintext
error: overly complex generic constant
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--> $DIR/dependence_lint.rs:17:9
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LL | [0; if false { size_of::<T>() } else { 3 }]; // lint on stable, error with gce
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ control flow is not supported in generic constants
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= help: consider moving this anonymous constant into a `const` function
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error: overly complex generic constant
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--> $DIR/dependence_lint.rs:21:17
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LL | let _: [u8; if true { size_of::<T>() } else { 3 }]; // error on stable, error with gce
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ control flow is not supported in generic constants
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= help: consider moving this anonymous constant into a `const` function
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error: unconstrained generic constant
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--> $DIR/dependence_lint.rs:14:12
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LL | let _: [u8; size_of::<*mut T>()]; // error on stable, error with gce
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| ^^^^^^^^^^^^^^^^^^^^^^^^^
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help: try adding a `where` bound
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LL | fn foo<T>() where [(); size_of::<*mut T>()]: {
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| ++++++++++++++++++++++++++++++++
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error: unconstrained generic constant
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--> $DIR/dependence_lint.rs:10:9
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LL | [0; size_of::<*mut T>()]; // lint on stable, error with `generic_const_exprs`
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| ^^^^^^^^^^^^^^^^^^^
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help: try adding a `where` bound
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LL | fn foo<T>() where [(); size_of::<*mut T>()]: {
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| ++++++++++++++++++++++++++++++++
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error: aborting due to 4 previous errors
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