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Rollup merge of #67642 - Mark-Simulacrum:relax-bounds, r=Amanieu

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Relax bounds on HashMap/HashSet

These APIs changed from the old bound listed to the new bound (possibly empty):

K: Hash + Eq -> K
* new
* with_capacity

K: Eq + Hash, S: BuildHasher -> K, S
* with_hasher
* with_capacity_and_hasher
* hasher

K: Eq + Hash + Debug -> K: Debug
S: BuildHasher -> S
HashMap as Debug

K: Eq + Hash -> K
S: BuildHasher + Default -> S: Default
HashMap as Default

Resolves #44777.
This commit is contained in:
Dylan DPC 2020-02-13 02:52:46 +01:00 • committed by GitHub
commit 2a201336ed
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4 changed files with 76 additions and 90 deletions
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1
src/test/ui/const-generics/array-impls/core-traits-no-impls-length-33.rs
View file

@ -6,7 +6,6 @@ pub fn no_debug() {
pub fn no_hash() {
use std::collections::HashSet;
let mut set = HashSet::new();
//~^ ERROR arrays only have std trait implementations for lengths 0..=32
set.insert([0_usize; 33]);
//~^ ERROR arrays only have std trait implementations for lengths 0..=32
}

19
src/test/ui/const-generics/array-impls/core-traits-no-impls-length-33.stderr
View file

@ -9,24 +9,15 @@ LL | println!("{:?}", [0_usize; 33]);
= note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
error[E0277]: arrays only have std trait implementations for lengths 0..=32
--> $DIR/core-traits-no-impls-length-33.rs:10:16
--> $DIR/core-traits-no-impls-length-33.rs:9:16
|
LL | set.insert([0_usize; 33]);
| ^^^^^^^^^^^^^ the trait `std::array::LengthAtMost32` is not implemented for `[usize; 33]`
|
= note: required because of the requirements on the impl of `std::cmp::Eq` for `[usize; 33]`
error[E0277]: arrays only have std trait implementations for lengths 0..=32
--> $DIR/core-traits-no-impls-length-33.rs:8:19
|
LL | let mut set = HashSet::new();
| ^^^^^^^^^^^^ the trait `std::array::LengthAtMost32` is not implemented for `[usize; 33]`
|
= note: required because of the requirements on the impl of `std::cmp::Eq` for `[usize; 33]`
= note: required by `std::collections::HashSet::<T>::new`
error[E0369]: binary operation `==` cannot be applied to type `[usize; 33]`
--> $DIR/core-traits-no-impls-length-33.rs:15:19
--> $DIR/core-traits-no-impls-length-33.rs:14:19
|
LL | [0_usize; 33] == [1_usize; 33]
| ------------- ^^ ------------- [usize; 33]
@ -36,7 +27,7 @@ LL | [0_usize; 33] == [1_usize; 33]
= note: an implementation of `std::cmp::PartialEq` might be missing for `[usize; 33]`
error[E0369]: binary operation `<` cannot be applied to type `[usize; 33]`
--> $DIR/core-traits-no-impls-length-33.rs:20:19
--> $DIR/core-traits-no-impls-length-33.rs:19:19
|
LL | [0_usize; 33] < [1_usize; 33]
| ------------- ^ ------------- [usize; 33]
@ -46,7 +37,7 @@ LL | [0_usize; 33] < [1_usize; 33]
= note: an implementation of `std::cmp::PartialOrd` might be missing for `[usize; 33]`
error[E0277]: the trait bound `&[usize; 33]: std::iter::IntoIterator` is not satisfied
--> $DIR/core-traits-no-impls-length-33.rs:25:14
--> $DIR/core-traits-no-impls-length-33.rs:24:14
|
LL | for _ in &[0_usize; 33] {
| ^^^^^^^^^^^^^^ the trait `std::iter::IntoIterator` is not implemented for `&[usize; 33]`
@ -58,7 +49,7 @@ LL | for _ in &[0_usize; 33] {
<&'a mut [T] as std::iter::IntoIterator>
= note: required by `std::iter::IntoIterator::into_iter`
error: aborting due to 6 previous errors
error: aborting due to 5 previous errors
Some errors have detailed explanations: E0277, E0369.
For more information about an error, try `rustc --explain E0277`.