Enforce that PointerLike requires a pointer-like ABI

[compiler-errors]

At least temporarily, let's ban coercing things that are pointer-sized and pointer-aligned but not Abi::Scalar(..) into dyn*. See: #104694 (comment)

This can be lifted in the future if we decie that we want to be able to coerce something repr(C) into a dyn*, but we'll have to figure out what to do with Miri and codegen...

r? compiler

[rustbot]

Hey! It looks like you've submitted a new PR for the library teams!

If this PR contains changes to any rust-lang/rust public library APIs then please comment with @rustbot label +T-libs-api -T-libs to tag it appropriately. If this PR contains changes to any unstable APIs please edit the PR description to add a link to the relevant API Change Proposal or create one if you haven't already. If you're unsure where your change falls no worries, just leave it as is and the reviewer will take a look and make a decision to forward on if necessary.

Examples of T-libs-api changes:

• Stabilizing library features
• Introducing insta-stable changes such as new implementations of existing stable traits on existing stable types
• Introducing new or changing existing unstable library APIs (excluding permanently unstable features / features without a tracking issue)
• Changing public documentation in ways that create new stability guarantees
• Changing observable runtime behavior of library APIs

Some changes occurred to the core trait solver

cc @rust-lang/initiative-trait-system-refactor

[bors]

☔ The latest upstream changes (presumably #108080) made this pull request unmergeable. Please resolve the merge conflicts.

[compiler-errors]

@bors r=cjgillot

[bors]

📌 Commit 920c51c has been approved by cjgillot

It is now in the queue for this repository.

[bors]

⌛ Testing commit 920c51c with merge 0030465...

[bors]

☀️ Test successful - checks-actions
Approved by: cjgillot
Pushing 0030465 to master...

[rust-timer]

Finished benchmarking commit (0030465): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-3.6%	[-3.6%, -3.6%]	1
All ❌✅ (primary)	-	-	0

Cycles

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-3.0%	[-3.0%, -3.0%]	1
All ❌✅ (primary)	-	-	0