ICE: expected int of size 8, but got size 1
#131101
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Category: This is a bug.
I-ICE
Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️
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Status: This bug is tracked inside the repo by a `known-bug` test.
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Nov 26, 2024
…, r=BoxyUwU
Simplify array length mismatch error reporting (to not try to turn consts into target usizes)
This changes `TypeError::FixedArrayLen` to use `ExpectedFound<ty::Const<'tcx>>` (instead of `ExpectedFound<u64>`), and renames it to `TypeError::ArrayLen`. This allows us to avoid a `try_to_target_usize` call in the type relation, which ICEs when we have a scalar of the wrong bit length (i.e. u8).
This also makes `structurally_relate_tys` to always use this type error kind any time we have a const mismatch resulting from relating the array-len part of `[T; N]`.
This has the effect of changing the error message we issue for array length mismatches involving non-valtree consts. I actually quite like the change, though, since before:
```
LL | fn test<const N: usize, const M: usize>() -> [u8; M] {
| ------- expected `[u8; M]` because of return type
LL | [0; N]
| ^^^^^^ expected `M`, found `N`
|
= note: expected array `[u8; M]`
found array `[u8; N]`
```
and after, which I think is far less verbose:
```
LL | fn test<const N: usize, const M: usize>() -> [u8; M] {
| ------- expected `[u8; M]` because of return type
LL | [0; N]
| ^^^^^^ expected an array with a size of M, found one with a size of N
```
The only questions I have are:
1. Should we do something about backticks here? Right now we don't backtick either fully evaluated consts like `2`, or rigid consts like `Foo::BAR`.... but maybe we should? It seems kinda verbose to do for numbers -- maybe we could intercept those specifically.
2. I guess we may still run the risk of leaking unevaluated consts into error reporting like `2 + 1`...?
r? `@BoxyUwU`
Fixes rust-lang#126359
Fixes rust-lang#131101
rust-timer
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Nov 27, 2024
Rollup merge of rust-lang#133367 - compiler-errors:array-len-mismatch, r=BoxyUwU Simplify array length mismatch error reporting (to not try to turn consts into target usizes) This changes `TypeError::FixedArrayLen` to use `ExpectedFound<ty::Const<'tcx>>` (instead of `ExpectedFound<u64>`), and renames it to `TypeError::ArrayLen`. This allows us to avoid a `try_to_target_usize` call in the type relation, which ICEs when we have a scalar of the wrong bit length (i.e. u8). This also makes `structurally_relate_tys` to always use this type error kind any time we have a const mismatch resulting from relating the array-len part of `[T; N]`. This has the effect of changing the error message we issue for array length mismatches involving non-valtree consts. I actually quite like the change, though, since before: ``` LL | fn test<const N: usize, const M: usize>() -> [u8; M] { | ------- expected `[u8; M]` because of return type LL | [0; N] | ^^^^^^ expected `M`, found `N` | = note: expected array `[u8; M]` found array `[u8; N]` ``` and after, which I think is far less verbose: ``` LL | fn test<const N: usize, const M: usize>() -> [u8; M] { | ------- expected `[u8; M]` because of return type LL | [0; N] | ^^^^^^ expected an array with a size of M, found one with a size of N ``` The only questions I have are: 1. Should we do something about backticks here? Right now we don't backtick either fully evaluated consts like `2`, or rigid consts like `Foo::BAR`.... but maybe we should? It seems kinda verbose to do for numbers -- maybe we could intercept those specifically. 2. I guess we may still run the risk of leaking unevaluated consts into error reporting like `2 + 1`...? r? ``@BoxyUwU`` Fixes rust-lang#126359 Fixes rust-lang#131101
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