Updates compiler error E0046 with new format

[shri3k]

Addresses #35209 as part of #35233.
r? @jonathandturner

I've repeated the following in my code. If this is something not desirable then let me know if there's any process to make this any cleaner. Thank you.

missing_items.iter()
    .map(|name| name.to_string())
     .collect::<Vec<_>>().join("`, `"))

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @jonathandturner (or someone else) soon.

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[sophiajt]

Thanks for the PR! You'll need to also update the unit tests in the src/test directory that test this error:

jturner-23759:rust jturner$ git grep E0046
src/doc/book/associated-constants.md:error: not all trait items implemented, missing: `ID` [E0046]
src/librustc_typeck/check/mod.rs:        span_err!(tcx.sess, impl_span, E0046,
src/librustc_typeck/diagnostics.rs:E0046: r##"
src/test/compile-fail/E0046.rs:impl Foo for Bar {} //~ ERROR E0046
src/test/compile-fail/impl-wrong-item-for-trait.rs:    //~^ ERROR E0046
src/test/compile-fail/impl-wrong-item-for-trait.rs:    //~^ ERROR E0046
src/test/compile-fail/impl-wrong-item-for-trait.rs:    //~^ ERROR E0046
src/test/compile-fail/issue-23729.rs:            //~^ ERROR not all trait items implemented, missing: `Item` [E0046]
src/test/compile-fail/issue-23827.rs:    //~^ ERROR not all trait items implemented, missing: `Output` [E0046]
src/test/compile-fail/issue-24356.rs:            //~^ ERROR not all trait items implemented, missing: `Target` [E0046]

[shri3k]

Oh damn, I thought I ran the unit test scripts too which showed no failed tests. I'll get to this when I get home tonight. Thank you for showing it in snippets.

[shri3k]

Hopefully, I've covered all the test files that mentions this error.

r? @jonathandturner

[sophiajt]

Looks good!

@bors r+ rollup

[bors]

📌 Commit 9f09ee5 has been approved by jonathandturner

[KiChjang]

Trailing whitespace on this line.

[sanxiyn]

@bors r-

[sophiajt]

@bors r+ rollup

[bors]

📌 Commit ed72c65 has been approved by jonathandturner