Rootless podman creates a separate user namespace, where an inner
`LOCAL_USER_ID` will map to a different subuid range on the host.
The "keep-id" mode maps the current UID directly into the container.
This makes `src/ci/docker/run.sh` work better for testing container
images on systems running podman, where "docker" is just a shim.
Move Error trait into core
This PR moves the error trait from the standard library into a new unstable `error` module within the core library. The goal of this PR is to help unify error reporting across the std and no_std ecosystems, as well as open the door to integrating the error trait into the panic reporting system when reporting panics whose source is an errors (such as via `expect`).
This PR is a rewrite of https://github.com/rust-lang/rust/pull/90328 using new compiler features that have been added to support error in core.
Fix rustc_parse_format precision & width spans
When a `precision`/`width` was `CountIsName - {:name$}` or `CountIs - {:10}` the `precision_span`/`width_span` was set to `None`
For `width` the name span in `CountIsName(_, name_span)` had its `.start` off by one
r? ``@fee1-dead`` / cc ``@PrestonFrom`` since this is similar to #99987
Migrate `rustc_plugin_impl` to `SessionDiagnostic`
Migration of the `rustc_plugin_impl` crate.
~Draft PR because it is blocked on #100694 for `#[fatal(...)]` support~ (this has been merged, and I've changed over to `#[diag(...)]` now too), but I would also like to know if what I did with `LoadPluginError` is okay, because all it does is display the error message from `libloading` ([See conversation on zulip](https://rust-lang.zulipchat.com/#narrow/stream/147480-t-compiler.2Fwg-diagnostics/topic/.23100717.20diagnostic.20translation/near/294327843)). This crate is apparently for a deprecated feature which is used by servo, so I don't know how much this matters anyway.
InferCtxt tainted_by_errors_flag should be Option<ErrorGuaranteed>
Fixes#100321.
Use Cell<Option<ErrorGuaranteed>> to guarantee that we emit an error when that flag is set.
Do not re-parse function signatures to suggest generics
This PR uses the existing resolution rib infrastructure to channel the correct span information to suggest generic parameters. This allows to avoid re-parsing a function's source code.
Drive-by cleanup: this removes useless `FnItemRibKind` from late resolution ribs. All the use cases are already covered by `ItemRibKind` and `AssocItemRibKind` which have more precise semantics.
Cranelift 0.87 now supports lowering `fma` as a libcall on x86 [0].
With 0.88 enabling the native x86 instruction under the `has_fma` flag.
aarch64 and s390x already support this as a native instruction, so it's
nice that we emit it for those.
We can't lower the SIMD version using the `fma` instruction since the
lowering can fail if the x86 `has_fma` flag is not enabled. Cranelift
doesn't yet know how to fallback for these cases
[0]: 709716bb8e
