--wip-- [skip ci]

get the generic text and put it int he suggestion, but suggestion not working on derive subdiagnostic

refactor away from derives and use span_suggestion() instead. Show's the correct(?) generic contents, but overwrites the fn name :(

x fmt

drop commented code and s/todo/fixme

get the correct diagnostic for functions, at least

x fmt

remove some debugs

remove format

remove debugs

remove useless change

remove useless change

remove legacy approach

correct lookahead + error message contains the ident name

fmt

refactor code

tests

add tests

remoev debug

remove comment

Co-authored-by: Takayuki Maeda <takoyaki0316@gmail.com>

This commit makes intra-doc link tooltips consistent with generated
links in function signatures and item tables, with the format
`itemtype foo::bar::baz`. This way, you can tell if a link points at
a trait or a type (for example) by mousing over it.

See also fce944d

…66_fix, r=TaKO8Ki

 Suggest fix for misplaced generic params on fn item rust-lang#103366

fixes rust-lang#103366

This still has some work to go, but works for 2/3 of the initial base cases described in #1033366

simple fn:
```
error: expected identifier, found `<`
 --> shreys/test_1.rs:1:3
  |
1 | fn<T> id(x: T) -> T { x }
  |   ^ expected identifier
  |
help: help: place the generic parameter list after the function name:
  |
1 | fn id<T>(x: T) -> T { x }
  |    ~~~~

```

Complicated bounds
```
error: expected identifier, found `<`
 --> spanishpear/test_2.rs:1:3
  |
1 | fn<'a, B: 'a + std::ops::Add<Output = u32>> f(_x: B) { }
  |   ^ expected identifier
  |
help: help: place the generic parameter list after the function name:
  |
1 | fn f<'a, B: 'a + std::ops::Add<Output = u32>>(_x: B) { }
  |    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```

Opening a draft PR for comments on approach, particularly I have the following questions:
 -  [x]  Is it okay to be using `err.span_suggestion` over struct derives? I struggled to get the initial implementation (particularly the correct suggestion message) on struct derives, although I think given what I've learned since starting, I could attempt re-doing it with that approach.
  -  [x] in the case where the snippet cannot be obtained from a span, is the `help` but no suggestion okay? I think yes (also, when does this case occur?)
  -  [x] are there any red flags for the generalisation of this work for relevant item kinds (i.e. `struct`, `enum`, `trait`, and `union`). My basic testing indicates it does work for those types except the help tip is currently hardcoded to `after the function name` - which should change dependent on the item.
  - [x] I am planning to not show the suggestion if there is already a `<` after the item identifier, (i.e. if there are already generics, as after a function name per the original issue). Any major objections?
  - [x] Is the style of error okay? I wasn't sure if there was a way to make it display nicer, or if thats handled by span_suggestion

These aren't blocking questions, and I will keep working on:
  - check if there is a `<` after the ident (and if so, not showing the suggestion)
  - generalize the help message
  - figuring out how to write/run/etc ui tests (including reading the docs for them)
  - logic cleanups

…_canonical_goal, r=lcnr

Check for overflow in evaluate_canonical_goal

r? `@lcnr`

…mpiler-errors

Avoid ICE when the generic_span is empty

Fixes rust-lang#107998
r? ```@TaKO8Ki```

"Basic usage" is redundant for there is just one example

…orkingjubilee

Shrink size of array benchmarks

Might've overdone it with the size of these benchmarks, as there's no need for them to be quite as large.

Fixes rust-lang#108011

add message to update Cargo.toml when x is changed

`@jyn514` Is this correct?

As mentioned in rust-lang#108021

…-tooltips, r=GuillaumeGomez

rustdoc: add more tooltips to intra-doc links

This commit makes intra-doc link tooltips consistent with generated links in function signatures and item tables, with the format `itemtype foo::bar::baz`. This way, you can tell if a link points at a trait or a type (for example) by mousing over it.

See also rust-lang#39697

Partially solves https://internals.rust-lang.org/t/rustdoc-suggestion-highlight-links-fn-s-mod-s-type-s-etc-appropriately-within-and-documentation/17931 (though the Internals thread asks for color-coding, while this PR adds a tooltip instead, it's accomplishing the same thing).

Before:

<img width="950" alt="image" src="https://user-images.githubusercontent.com/1593513/218653059-911cea01-7231-438a-ad98-be98ab73783f.png">

After:

<img width="432" alt="image" src="https://user-images.githubusercontent.com/1593513/218653201-34ca3aa7-18f1-4cb1-be68-a1411bbe797e.png">

s/eval_usize/eval_target_usize/ for clarity

r? `@nnethercote`

as discussed in https://rust-lang.zulipchat.com/#narrow/stream/131828-t-compiler/topic/.60Const.60.20and.20.60usize.60.2F.60u64.60 it is unclear what `usize` means and why we use a `u64` for something talking about `usize`. This renaming should make it clear that we're talking about `usize`s on the target platform, irrespective of the compiler host platform.

…ess, r=Mark-Simulacrum

Avoid using a dead email address as the main email address

This caused highfive to welcome me as a new contributor on every PR, because it couldn't find any commits of mine.

…constraints, r=lcnr

Remove needless supertrait constraints from Interner projections

These associated types are already all constrained to implement `Ord`, so specifically requiring its supertraits `Eq`, `PartialEq` and `PartialOrd` is superfluous.