Teach `compiletest` to ignore platform triples
The UI tests are written assuming `--remap-path-prefix` is *not used* (`remap-debuginfo` in `config.toml`). The consequence is that the error messages may include paths and snippets into the standard library. When `remap-debuginfo` is enabled, these messages change in format and structure because `rustc` will not show paths and snippets into the standard library.
This normally isn't a problem for the "main" platforms (linux/macos/windows), because the CI infrastructure is set up so that the tests run without `remap-debuginfo`, but the `dist` artifacts are built separately with `remap-debuginfo` enabled. However, some of the lower-tier platforms perform both tests and distribution in a single step with `remap-debuginfo` enabled. This also affects developers and distributors who use `remap-debuginfo`.
To sidestep this problem, we add a way to ignore tests in specific platform triples, and update the overly broad `ignore-x86` rule in affected tests.
Address #46948, #54546, #53081.
doc comments: Less attribute mimicking
Make sure doc comments are not converted into intermediate meta-items, or not mixed with `doc(inline)` or something like that.
Follow-up to https://github.com/rust-lang/rust/pull/65750.
During MIR interpretation it may happen that a place containing
uninitialized bytes is copied. This would read the current
representation of these bytes and write it to the destination even
though they must, by definition, not matter to the execution.
This elides that representation change when no bytes are defined in such
a copy, saving some cpu cycles. In such a case, the memory of the target
allocation is not touched at all which also means that sometimes no
physical page backing the memory allocation of the representation needs
to be provided by the OS at all, reducing memory pressure on the system.
prune ill-conceived BTreeMap iter_mut assertion and test its mutability
Proposal to deal with #67438 (and I'm more sure now that this is the right thing to do).
Passes testing with miri.
Document safety of Path casting
I would personally feel more comfortable making the relevant (internal anyway) types repr(transparent) and then documenting that we can make these casts because of that, but I believe this is a more minimal PR, so posting it first.
Resolves#45910.
Remove redundant link texts
Most of these links are followed by a parenthesized expression. I think that the redundant link texts were added to prevent interpretation as an inline link. This is unnecessary since the closing square bracket and opening parenthesis are separated by whitespace.
Use NonNull in slice::Iter and slice::IterMut.
`ptr` of `slice::Iter` and `slice::IterMut` can never be null, but this
fact wasn't exploited for layout optimizations. By changing `ptr` from
`*<mutability> T` to `NonNull<T>`, the compiler can now optimize layout
of `Option<Iter<'a, T>>`.
Closes#67228
Implement padding for IpAddr without heap alloc
Implements padding for `IpAddr`s without heap allocations.
This fixes issue #66810 .
cc @jethrogb @mzohreva
