…diagnostics-uncommon-codepoints, r=Manishearth

Split Diagnostics for Uncommon Codepoints: Add List to Display Characters Involved

This Pull Request adds a list of the uncommon codepoints involved in the `uncommon_codepoints` lint, as outlined as a first step in rust-lang#120228.

Example rendered diagnostic:
```
error: identifier contains an uncommon Unicode codepoint: 'µ'
  --> $DIR/lint-uncommon-codepoints.rs:3:7
   |
LL | const µ: f64 = 0.000001;
   |       ^
   |
note: the lint level is defined here
  --> $DIR/lint-uncommon-codepoints.rs:1:9
   |
LL | #![deny(uncommon_codepoints)]
   |         ^^^^^^^^^^^^^^^^^^^
```

(Retrying rust-lang#120258.)

Rollup of 12 pull requests

Successful merges:

 - rust-lang#112806 (Small code improvements in `collect_intra_doc_links.rs`)
 - rust-lang#119460 (coverage: Never emit improperly-ordered coverage regions)
 - rust-lang#119766 (Split tait and impl trait in assoc items logic)
 - rust-lang#120062 (llvm: change data layout bug to an error and make it trigger more)
 - rust-lang#120099 (linker: Refactor library linking methods in `trait Linker`)
 - rust-lang#120139 (Do not normalize closure signature when building `FnOnce` shim)
 - rust-lang#120160 (Manually implement derived `NonZero` traits.)
 - rust-lang#120171 (Fix assume and assert in jump threading)
 - rust-lang#120183 (Add `#[coverage(off)]` to closures introduced by `#[test]` and `#[bench]`)
 - rust-lang#120195 (add several resolution test cases)
 - rust-lang#120259 (Split Diagnostics for Uncommon Codepoints: Add List to Display Characters Involved)
 - rust-lang#120261 (Provide structured suggestion to use trait objects in some cases of `if` arm type divergence)

r? `@ghost`
`@rustbot` modify labels: rollup

Rollup of 9 pull requests

Successful merges:

 - rust-lang#112806 (Small code improvements in `collect_intra_doc_links.rs`)
 - rust-lang#119766 (Split tait and impl trait in assoc items logic)
 - rust-lang#120139 (Do not normalize closure signature when building `FnOnce` shim)
 - rust-lang#120160 (Manually implement derived `NonZero` traits.)
 - rust-lang#120171 (Fix assume and assert in jump threading)
 - rust-lang#120183 (Add `#[coverage(off)]` to closures introduced by `#[test]` and `#[bench]`)
 - rust-lang#120195 (add several resolution test cases)
 - rust-lang#120259 (Split Diagnostics for Uncommon Codepoints: Add List to Display Characters Involved)
 - rust-lang#120261 (Provide structured suggestion to use trait objects in some cases of `if` arm type divergence)

r? `@ghost`
`@rustbot` modify labels: rollup

Rollup merge of rust-lang#120259 - HTGAzureX1212:HTGAzureX1212/split-diagnostics-uncommon-codepoints, r=Manishearth

Split Diagnostics for Uncommon Codepoints: Add List to Display Characters Involved

This Pull Request adds a list of the uncommon codepoints involved in the `uncommon_codepoints` lint, as outlined as a first step in rust-lang#120228.

Example rendered diagnostic:
```
error: identifier contains an uncommon Unicode codepoint: 'µ'
  --> $DIR/lint-uncommon-codepoints.rs:3:7
   |
LL | const µ: f64 = 0.000001;
   |       ^
   |
note: the lint level is defined here
  --> $DIR/lint-uncommon-codepoints.rs:1:9
   |
LL | #![deny(uncommon_codepoints)]
   |         ^^^^^^^^^^^^^^^^^^^
```

(Retrying rust-lang#120258.)