Some more fixes for transmute_undefined_repr

[Jarcho]

changelog: Fix transmuting a struct containing a pointer into a pointer in transmute_undefined_repr
changelog: Allow various forms of type erasure in transmute_undefined_repr

[rust-highfive]

r? @Manishearth

(rust-highfive has picked a reviewer for you, use r? to override)

[Manishearth]

Can we include the nurseryification and a comment linking to a followup about properly investigating this lint here?

[Jarcho]

Is there a particular reason to not merge this separately from that considering there's already a pr for it?

[Manishearth]

@bors r+

nah it's fine

[bors]

📌 Commit 1777841 has been approved by Manishearth

[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 transmute_undefined (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 transmute_undefined --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

Auto-merging clippy_utils/src/ty.rs
CONFLICT (content): Merge conflict in clippy_utils/src/ty.rs
Automatic merge failed; fix conflicts and then commit the result.

[bors]

☔ The latest upstream changes (presumably #8381) made this pull request unmergeable. Please resolve the merge conflicts.

[Manishearth]

@bors r+

[bors]

📌 Commit d28d19d has been approved by Manishearth

[bors]

⌛ Testing commit d28d19d with merge 29ee5e2...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: Manishearth
Pushing 29ee5e2 to master...