in function body use `impl for`, expand to `for loop`

[A4-Tacks]

rust-analyzer version: rust-analyzer 1.80.0 (05147895 2024-07-21)

rustc version: rustc 1.80.0 (051478957 2024-07-21)

editor or extension: Vim

code snippet to reproduce:

fn foo() {
    struct X;
    impl X fo { }
}

select completion list...

output:

fn foo() {
    struct X;
    impl X for  in  {
        
    } { }
}

expect:

fn foo() {
    struct X;
    impl X for  { }
}

[rami3l]

@rustbot claim