Rollup of 6 pull requests

[jhpratt]

Successful merges:

• library: use strict provenance lints consistently #156832 (library: use strict provenance lints consistently)
• net tests: let the OS pick the port numbers #157006 (net tests: let the OS pick the port numbers)
• Avoid redundant note when a #[derive] is already suggested #157126 (Avoid redundant note when a #[derive] is already suggested)
• std: Refactor env::var function #151690 (std: Refactor env::var function)
• std::process: uefi: avoid panicking in Stdio From impls. #155826 (std::process: uefi: avoid panicking in Stdio From impls.)
• Migrate libraries from ptr::slice_from_raw_parts to .cast_slice #156109 (Migrate libraries from ptr::slice_from_raw_parts to .cast_slice)

r? @ghost

Create a similar rollup

[jhpratt]

@bors r+ rollup=never p=5

[rust-bors]

📌 Commit 6e38224 has been approved by jhpratt

It is now in the queue for this repository.

[rust-log-analyzer]

The job dist-ohos-armv7 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

[RUSTC-TIMING] object test:false 5.189
error: under strict provenance it is considered bad style to cast pointer `*mut libc::c_void` to integer `u32`
   --> /rustc/535179da9caa88b0ddd0f3426e5a242fcb932f07/library/std/src/os/unix/thread.rs:35:9
    |
 35 |         self.as_inner().id() as RawPthread
    |         ^^^^^^^^^^^^^^^^^^^^--------------
    |                             |
    |                             help: use `.addr()` to obtain the address of a pointer: `.addr() as u32`
    |
    = help: if you can't comply with strict provenance and need to expose the pointer provenance you can use `.expose_provenance()` instead
note: the lint level is defined here
   --> /rustc/535179da9caa88b0ddd0f3426e5a242fcb932f07/library/std/src/lib.rs:249:9
    |
249 | #![deny(lossy_provenance_casts)]
    |         ^^^^^^^^^^^^^^^^^^^^^^

error: under strict provenance it is considered bad style to cast pointer `*mut libc::c_void` to integer `u32`
  --> /rustc/535179da9caa88b0ddd0f3426e5a242fcb932f07/library/std/src/os/unix/thread.rs:39:9
   |
39 |         self.into_inner().into_id() as RawPthread
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^--------------
   |                                    |
   |                                    help: use `.addr()` to obtain the address of a pointer: `.addr() as u32`
   |
   = help: if you can't comply with strict provenance and need to expose the pointer provenance you can use `.expose_provenance()` instead

[RUSTC-TIMING] std test:false 3.514
error: could not compile `std` (lib) due to 2 previous errors

[rust-bors]

💔 Test for 535179d failed: CI. Failed job:

• auto - dist-ohos-armv7 (web logs, enhanced plaintext logs)

[rust-bors]

PR #156832, which is a member of this rollup, was unapproved.