This stabilizes process_set_argv0 targeting 1.45.0. It has been
useful in practice and seems useful as-is.

The equivalent feature could be implemented for Windows, but as far as I
know nobody has. That can be done separately.

Tracking issue: rust-lang#66510

Fix suggestion to borrow in struct

The corresponding issue is rust-lang#71136.
The compiler suggests that borrowing `the_foos` might solve the problem. This is obviously incorrect.
```
struct Foo(u8);

#[derive(Clone)]
struct FooHolster {
    the_foos: Vec<Foo>,
}
```

I propose as fix to check if there is any colon in the span. However, there might a case where `my_method(B { a: 1, b : foo })` would be appropriate to show a suggestion for `&B ...`.  To fix that too, we can simply check if there is a bracket in the span. This is only possible because both spans are different.
Issue's span: `the_foos: Vec<Foo>`
other's span: `B { a : 1, b : foo }`

Stabilize process_set_argv0 feature for Unix

This stabilizes process_set_argv0 targeting 1.45.0. It has been
useful in practice and seems useful as-is.

The equivalent feature could be implemented for Windows, but as far as I
know nobody has. That can be done separately.

Tracking issue: rust-lang#66510

…an-DPC

Clean up E0590 explanation

r? @Dylan-DPC

…an-DPC

Clean up E0593 explanation

r? @Dylan-DPC

…-Simulacrum

[self-profling] Record the cgu name when doing codegen for a module

Add fast-path optimization for Ipv4Addr::fmt

Don't use an intermediary buffer when writing an IPv4 address without any specific alignment options

…Simulacrum

rustllvm: Fix warnings about unused function parameters

And then perform corresponding cleanups on Rust side.

Fixes rust-lang#72427