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const evaluatable: improve
TooGeneric
handling
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44 changes: 20 additions & 24 deletions
44
src/test/ui/const-generics/const_evaluatable_checked/cross_crate_predicate.stderr
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -1,54 +1,50 @@ | ||
error: constant expression depends on a generic parameter | ||
error: unconstrained generic constant | ||
--> $DIR/cross_crate_predicate.rs:7:13 | ||
| | ||
LL | let _ = const_evaluatable_lib::test1::<T>(); | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
| | ||
::: $DIR/auxiliary/const_evaluatable_lib.rs:6:10 | ||
| | ||
LL | [u8; std::mem::size_of::<T>() - 1]: Sized, | ||
| ---------------------------- required by this bound in `test1` | ||
help: consider adding a `where` bound for this expression | ||
--> $DIR/auxiliary/const_evaluatable_lib.rs:6:10 | ||
| | ||
= note: this may fail depending on what value the parameter takes | ||
LL | [u8; std::mem::size_of::<T>() - 1]: Sized, | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
|
||
error: constant expression depends on a generic parameter | ||
error: unconstrained generic constant | ||
--> $DIR/cross_crate_predicate.rs:7:13 | ||
| | ||
LL | let _ = const_evaluatable_lib::test1::<T>(); | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
| | ||
::: $DIR/auxiliary/const_evaluatable_lib.rs:4:27 | ||
| | ||
LL | pub fn test1<T>() -> [u8; std::mem::size_of::<T>() - 1] | ||
| ---------------------------- required by this bound in `test1` | ||
help: consider adding a `where` bound for this expression | ||
--> $DIR/auxiliary/const_evaluatable_lib.rs:4:27 | ||
| | ||
= note: this may fail depending on what value the parameter takes | ||
LL | pub fn test1<T>() -> [u8; std::mem::size_of::<T>() - 1] | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
|
||
error: constant expression depends on a generic parameter | ||
error: unconstrained generic constant | ||
--> $DIR/cross_crate_predicate.rs:7:13 | ||
| | ||
LL | let _ = const_evaluatable_lib::test1::<T>(); | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
| | ||
::: $DIR/auxiliary/const_evaluatable_lib.rs:6:10 | ||
| | ||
LL | [u8; std::mem::size_of::<T>() - 1]: Sized, | ||
| ---------------------------- required by this bound in `test1` | ||
help: consider adding a `where` bound for this expression | ||
--> $DIR/auxiliary/const_evaluatable_lib.rs:6:10 | ||
| | ||
= note: this may fail depending on what value the parameter takes | ||
LL | [u8; std::mem::size_of::<T>() - 1]: Sized, | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
|
||
error: constant expression depends on a generic parameter | ||
error: unconstrained generic constant | ||
--> $DIR/cross_crate_predicate.rs:7:13 | ||
| | ||
LL | let _ = const_evaluatable_lib::test1::<T>(); | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
| | ||
::: $DIR/auxiliary/const_evaluatable_lib.rs:4:27 | ||
| | ||
LL | pub fn test1<T>() -> [u8; std::mem::size_of::<T>() - 1] | ||
| ---------------------------- required by this bound in `test1` | ||
help: consider adding a `where` bound for this expression | ||
--> $DIR/auxiliary/const_evaluatable_lib.rs:4:27 | ||
| | ||
= note: this may fail depending on what value the parameter takes | ||
LL | pub fn test1<T>() -> [u8; std::mem::size_of::<T>() - 1] | ||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | ||
|
||
error: aborting due to 4 previous errors | ||
|
24 changes: 24 additions & 0 deletions
24
src/test/ui/const-generics/const_evaluatable_checked/infer-too-generic.rs
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,24 @@ | ||
// run-pass | ||
#![feature(const_generics, const_evaluatable_checked)] | ||
#![allow(incomplete_features)] | ||
|
||
use std::{mem, ptr}; | ||
|
||
fn split_first<T, const N: usize>(arr: [T; N]) -> (T, [T; N - 1]) | ||
where | ||
[T; N - 1]: Sized, | ||
{ | ||
let arr = mem::ManuallyDrop::new(arr); | ||
unsafe { | ||
let head = ptr::read(&arr[0]); | ||
let tail = ptr::read(&arr[1..] as *const [T] as *const [T; N - 1]); | ||
(head, tail) | ||
} | ||
} | ||
|
||
fn main() { | ||
let arr = [0, 1, 2, 3, 4]; | ||
let (head, tail) = split_first(arr); | ||
assert_eq!(head, 0); | ||
assert_eq!(tail, [1, 2, 3, 4]); | ||
} |
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