When suggesting dereferencing something that can be iterable in a `for`
loop, erase lifetimes and use a fresh `ty::ParamEnv` to avoid 'region
constraints already solved' panic.

Fix  rust-lang#87657.

…trochenkov"

Fixes rust-lang#87877

This change interacts badly with `noop_flat_map_stmt`,
which synthesizes multiple statements with the same `NodeId`.

I'm working on a better fix that will still allow us to
remove this special case. For now, let's revert the change
to fix the ICE.

This reverts commit a4262cc, reversing
changes made to 8ee962f.

…ion, r=oli-obk

Avoid ICE caused by suggestion

When suggesting dereferencing something that can be iterable in a `for`
loop, erase lifetimes and use a fresh `ty::ParamEnv` to avoid 'region
constraints already solved' panic.

Fix rust-lang#87657, fix rust-lang#87709, fix rust-lang#87651.

Fix `command-create-pidfd` test inside unprivileged Docker containers

In `src/test/ui/command/command-create-pidfd.rs` (added rust-lang#81825), the detection code to skip the test on unsupported platforms doesn't account for unprivileged Docker containers (CI uses privileged containers), which leads to a test failure as you can't call the `clone3` syscall in that environment. This PR enhances the detection code to also consider unprivileged containers.

…enkov

Revert "Rollup merge of rust-lang#87779 - Aaron1011:stmt-ast-id, r=petrochenkov"

Fixes rust-lang#87877

This change interacts badly with `noop_flat_map_stmt`,
which synthesizes multiple statements with the same `NodeId`.

I'm working on a better fix that will still allow us to
remove this special case. For now, let's revert the change
to fix the ICE.

This reverts commit a4262cc, reversing
changes made to 8ee962f.

…=notriddle

Add rustdoc GUI test for headers

Add test for rust-lang#87861.

r? ``@notriddle``