Delete unstable deprecated APIs

[Mark-Simulacrum]

Removes std_unicode, char::decode_utf8, ptr::offset_to, io::Read::chars.

These were all deprecated at least 6 weeks ago I believe so seems like it's time to delete them.

[rust-highfive]

r? @alexcrichton

(rust_highfive has picked a reviewer for you, use r? to override)

[alexcrichton]

@bors: r+

[bors]

📌 Commit 897e3769549f67ac420111a5b7f8733f7328fd03 has been approved by alexcrichton

[bors]

🔒 Merge conflict

This pull request and the master branch diverged in a way that cannot be automatically merged. Please rebase on top of the latest master branch, and let the reviewer approve again.

How do I rebase?

Assuming self is your fork and upstream is this repository, you can resolve the conflict following these steps:

1. git checkout delete-deprecated (switch to your branch)
2. git fetch upstream master (retrieve the latest master)
3. git rebase upstream/master -p (rebase on top of it)
4. Follow the on-screen instruction to resolve conflicts (check git status if you got lost).
5. git push self delete-deprecated --force-with-lease (update this PR)

You may also read Git Rebasing to Resolve Conflicts by Drew Blessing for a short tutorial.

Please avoid the "Resolve conflicts" button on GitHub. It uses git merge instead of git rebase which makes the PR commit history more difficult to read.

Sometimes step 4 will complete without asking for resolution. This is usually due to difference between how Cargo.lock conflict is handled during merge and rebase. This is normal, and you should still perform step 5 to update this PR.

Error message

warning: Cannot merge binary files: src/Cargo.lock (HEAD vs. heads/homu-tmp)
Removing src/libstd_unicode/lib.rs
Removing src/libstd_unicode/Cargo.toml
Auto-merging src/Cargo.lock
CONFLICT (content): Merge conflict in src/Cargo.lock
Automatic merge failed; fix conflicts and then commit the result.

[Mark-Simulacrum]

@bors r=alexcrichton

[bors]

📌 Commit 4f1bd763c8d1687362af9af8550e097ef19e768b has been approved by alexcrichton

[kennytm]

@bors r-

distcheck failed.

[00:11:11] Dist src
[00:11:11] thread 'main' panicked at 'could not read dir "/checkout/src/libstd_unicode": Os { code: 2, kind: NotFound, message: "No such file or directory" }', bootstrap/lib.rs:1248:25

[Mark-Simulacrum]

@bors r=alexcrichton

[bors]

📌 Commit b0ecdf9 has been approved by alexcrichton

[SimonSapin]

This might be identical to #52732.

[SimonSapin]

Ah no, #52732 also removes deprecated AsciiExt methods.

[Mark-Simulacrum]

Oh, sorry, missed that -- want to rebase and approve that PR?

[SimonSapin]

Done. Bors acknowledged #52732 (comment) but it seems the homu queue didn’t get the memo…