Rollup of 6 pull requests

[Dylan-DPC]

Successful merges:

• Ensure that '_ and GAT yields errors #95312 (Ensure that '_ and GAT yields errors)
• Add more diagnostic items #96302 (Add more diagnostic items)
• std: directly use pthread in UNIX parker implementation #96393 (std: directly use pthread in UNIX parker implementation)
• Migrate ambiguous plus diagnostic to the new derive macro #96405 (Migrate ambiguous plus diagnostic to the new derive macro)
• Recover suggestions to introduce named lifetime under NLL #96409 (Recover suggestions to introduce named lifetime under NLL)
• Fixed grammatical error in example comment #96480 (Fixed grammatical error in example comment)

Failed merges:

r? @ghost
@rustbot modify labels: rollup

Create a similar rollup

[Dylan-DPC]

@bors r+ rollup=never p=5

[bors]

📌 Commit 439d24e has been approved by Dylan-DPC

[bors]

⌛ Testing commit 439d24e with merge 37abde90a3c9db188b070e7f3e38741bccbbb167...

[bors]

💔 Test failed - checks-actions

[rust-log-analyzer]

The job dist-x86_64-netbsd failed! Check out the build log: (web) (plain)

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

[RUSTC-TIMING] object test:false 6.014
error: unused doc comment
  --> library/std/src/sys/unix/thread_parker.rs:71:5
   |
71 |       /// Use the monotonic clock on other systems.
   |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
72 |       #[cfg(not(any(target_os = "macos", target_os = "ios", target_os = "espidf")))]
73 | /     let (now, dur) = {
74 | |         use super::time::Timespec;
75 | |
76 | |         (Timespec::now(libc::CLOCK_MONOTONIC).t, dur)
   | |______- rustdoc does not generate documentation for statements
   |
   |
   = note: `-D unused-doc-comments` implied by `-D warnings`
   = help: use `//` for a plain comment

error[E0599]: no method named `checked_add_duration` found for struct `timespec` in the current scope
   |
   |
79 |     let timeout = now.checked_add_duration(&dur).map(|t| t.t).unwrap_or(TIMESPEC_MAX);
   |                       ^^^^^^^^^^^^^^^^^^^^ method not found in `timespec`
For more information about this error, try `rustc --explain E0599`.
[RUSTC-TIMING] std test:false 2.656
error: could not compile `std` due to 2 previous errors
Build completed unsuccessfully in 0:06:37

[m-ou-se]

Caused by #96393