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Rollup merge of rust-lang#105292 - JulianKnodt:no_eager_commit, r=Box…
…yUwU Change a commit_if_ok call to probe Removes an over-eager `commit_if_ok` which makes inference worse. I'm not entirely sure whether it's ok to remove the check that types are the same, because casting seems to cause equality checks with incorrect types? Fixes rust-lang#105037 r? `@BoxyUwU`
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#![feature(generic_const_exprs)] | ||
#![allow(incomplete_features)] | ||
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fn foo<const N: usize, const M: usize>() -> [(); N+2] | ||
where | ||
[(); N + 1]:, | ||
[(); M + 1]:, | ||
{ | ||
bar() | ||
//~^ ERROR: unconstrained | ||
} | ||
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fn bar<const N: usize>() -> [(); N] | ||
where | ||
[(); N + 1]:, | ||
{ | ||
[(); N] | ||
} | ||
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fn main() {} |
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@@ -0,0 +1,18 @@ | ||
error: unconstrained generic constant | ||
--> $DIR/ensure_is_evaluatable.rs:9:5 | ||
| | ||
LL | bar() | ||
| ^^^ | ||
| | ||
= help: try adding a `where` bound using this expression: `where [(); N + 1]:` | ||
note: required by a bound in `bar` | ||
--> $DIR/ensure_is_evaluatable.rs:15:10 | ||
| | ||
LL | fn bar<const N: usize>() -> [(); N] | ||
| --- required by a bound in this | ||
LL | where | ||
LL | [(); N + 1]:, | ||
| ^^^^^ required by this bound in `bar` | ||
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||
error: aborting due to previous error | ||
|
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@@ -0,0 +1,23 @@ | ||
#![feature(generic_const_exprs)] | ||
#![allow(incomplete_features)] | ||
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const fn both(_: usize, b: usize) -> usize { | ||
b | ||
} | ||
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fn foo<const N: usize, const M: usize>() -> [(); N + 2] | ||
where | ||
[(); both(N + 1, M + 1)]:, | ||
{ | ||
bar() | ||
//~^ ERROR: unconstrained generic constant | ||
} | ||
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fn bar<const N: usize>() -> [(); N] | ||
where | ||
[(); N + 1]:, | ||
{ | ||
[(); N] | ||
} | ||
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fn main() {} |
18 changes: 18 additions & 0 deletions
18
src/test/ui/const-generics/fn_with_two_const_inputs.stderr
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@@ -0,0 +1,18 @@ | ||
error: unconstrained generic constant | ||
--> $DIR/fn_with_two_const_inputs.rs:12:5 | ||
| | ||
LL | bar() | ||
| ^^^ | ||
| | ||
= help: try adding a `where` bound using this expression: `where [(); N + 1]:` | ||
note: required by a bound in `bar` | ||
--> $DIR/fn_with_two_const_inputs.rs:18:10 | ||
| | ||
LL | fn bar<const N: usize>() -> [(); N] | ||
| --- required by a bound in this | ||
LL | where | ||
LL | [(); N + 1]:, | ||
| ^^^^^ required by this bound in `bar` | ||
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error: aborting due to previous error | ||
|
22 changes: 22 additions & 0 deletions
22
src/test/ui/const-generics/fn_with_two_same_const_inputs.rs
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// check-pass | ||
#![feature(generic_const_exprs)] | ||
#![allow(incomplete_features)] | ||
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const fn both(_: usize, b: usize) -> usize { | ||
b | ||
} | ||
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fn foo<const N: usize>() | ||
where | ||
[(); both(N + 1, N + 1)]:, | ||
{ | ||
bar::<N>(); | ||
} | ||
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fn bar<const N: usize>() | ||
where | ||
[(); N + 1]:, | ||
{ | ||
} | ||
|
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fn main() {} |
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@@ -0,0 +1,35 @@ | ||
// run-pass | ||
#![feature(generic_const_exprs)] | ||
#![allow(incomplete_features)] | ||
#![allow(dead_code)] | ||
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trait Table<const D: usize>: Sync { | ||
const COLUMNS: usize; | ||
} | ||
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struct Table1<const D: usize>; | ||
impl<const D: usize> Table<D> for Table1<D> { | ||
const COLUMNS: usize = 123; | ||
} | ||
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struct Table2<const D: usize>; | ||
impl<const D: usize> Table<D> for Table2<D> { | ||
const COLUMNS: usize = 456; | ||
} | ||
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fn process_table<T: Table<D>, const D: usize>(_table: T) | ||
where | ||
[(); T::COLUMNS]:, | ||
{ | ||
} | ||
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fn process_all_tables<const D: usize>() | ||
where | ||
[(); Table2::<D>::COLUMNS]:, | ||
[(); Table1::<D>::COLUMNS]:, | ||
{ | ||
process_table(Table1::<D>); | ||
process_table(Table2::<D>); | ||
} | ||
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fn main() {} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,19 @@ | ||
// check-pass | ||
#![feature(generic_const_exprs)] | ||
#![allow(incomplete_features)] | ||
|
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fn foo<const N: usize>() | ||
where | ||
[(); N + 1]:, | ||
[(); N + 1]:, | ||
{ | ||
bar::<N>(); | ||
} | ||
|
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fn bar<const N: usize>() | ||
where | ||
[(); N + 1]:, | ||
{ | ||
} | ||
|
||
fn main() {} |
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@@ -0,0 +1,18 @@ | ||
#![feature(generic_const_exprs)] | ||
#![allow(incomplete_features)] | ||
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fn foo<const N: usize>() | ||
where | ||
[(); N + 1 + 1]:, | ||
{ | ||
bar(); | ||
//~^ ERROR: type annotations | ||
} | ||
|
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fn bar<const N: usize>() | ||
where | ||
[(); N + 1]:, | ||
{ | ||
} | ||
|
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fn main() {} |
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error[E0284]: type annotations needed | ||
--> $DIR/unify_with_nested_expr.rs:8:5 | ||
| | ||
LL | bar(); | ||
| ^^^ cannot infer the value of the const parameter `N` declared on the function `bar` | ||
| | ||
note: required by a bound in `bar` | ||
--> $DIR/unify_with_nested_expr.rs:14:10 | ||
| | ||
LL | fn bar<const N: usize>() | ||
| --- required by a bound in this | ||
LL | where | ||
LL | [(); N + 1]:, | ||
| ^^^^^ required by this bound in `bar` | ||
help: consider specifying the generic argument | ||
| | ||
LL | bar::<N>(); | ||
| +++++ | ||
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error: aborting due to previous error | ||
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For more information about this error, try `rustc --explain E0284`. |