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Auto merge of #91660 - llogiq:make-a-hash-of-def-ids, r=nnethercote

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manually implement `Hash` for `DefId`

This might speed up hashing for hashers that can work on individual u64s. Just as an experiment, suggested in a reddit thread on `FxHasher`. cc `@nnethercote`

Note that this should not be merged as is without cfg-ing the code path for 64 bits.
This commit is contained in:
bors 2021-12-14 01:39:01 +00:00
commit a2d25b4ff7
3 changed files with 48 additions and 22 deletions
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22
src/test/ui/coherence/coherence-orphan.stderr
View file

@ -1,14 +1,3 @@
error[E0117]: only traits defined in the current crate can be implemented for arbitrary types
--> $DIR/coherence-orphan.rs:17:1
|
LL | impl !Send for Vec<isize> { }
| ^^^^^^^^^^^^^^^----------
| | |
| | `Vec` is not defined in the current crate
| impl doesn't use only types from inside the current crate
|
= note: define and implement a trait or new type instead
error[E0117]: only traits defined in the current crate can be implemented for arbitrary types
--> $DIR/coherence-orphan.rs:10:1
|
@ -21,6 +10,17 @@ LL | impl TheTrait<usize> for isize { }
|
= note: define and implement a trait or new type instead
error[E0117]: only traits defined in the current crate can be implemented for arbitrary types
--> $DIR/coherence-orphan.rs:17:1
|
LL | impl !Send for Vec<isize> { }
| ^^^^^^^^^^^^^^^----------
| | |
| | `Vec` is not defined in the current crate
| impl doesn't use only types from inside the current crate
|
= note: define and implement a trait or new type instead
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0117`.

12
src/test/ui/methods/method-ambig-two-traits-cross-crate.stderr
View file

@ -4,20 +4,20 @@ error[E0034]: multiple applicable items in scope
LL | fn main() { 1_usize.me(); }
| ^^ multiple `me` found
|
note: candidate #1 is defined in an impl of the trait `Me2` for the type `usize`
= note: candidate #1 is defined in an impl of the trait `Me` for the type `usize`
note: candidate #2 is defined in an impl of the trait `Me2` for the type `usize`
--> $DIR/method-ambig-two-traits-cross-crate.rs:10:22
|
LL | impl Me2 for usize { fn me(&self) -> usize { *self } }
| ^^^^^^^^^^^^^^^^^^^^^
= note: candidate #2 is defined in an impl of the trait `Me` for the type `usize`
help: disambiguate the associated function for candidate #1
|
LL | fn main() { Me2::me(&1_usize); }
| ~~~~~~~~~~~~~~~~~
help: disambiguate the associated function for candidate #2
|
LL | fn main() { Me::me(&1_usize); }
| ~~~~~~~~~~~~~~~~
help: disambiguate the associated function for candidate #2
|
LL | fn main() { Me2::me(&1_usize); }
| ~~~~~~~~~~~~~~~~~
error: aborting due to previous error