Rollup merge of #128084 - surechen:fix_125997_v1, r=cjgillot

Suggest adding Result return type for associated method in E0277.

Recommit #126515 because I messed up during rebase,

Suggest adding Result return type for associated method in E0277.

For following:

```rust
struct A;
impl A {
    fn test4(&self) {
        let mut _file = File::create("foo.txt")?;
        //~^ ERROR the `?` operator can only be used in a method
    }
```

Suggest:

```rust
impl A {
    fn test4(&self) -> Result<(), Box<dyn std::error::Error>> {
        let mut _file = File::create("foo.txt")?;
        //~^ ERROR the `?` operator can only be used in a method

    Ok(())
    }
}
```

For #125997

r? `@cjgillot`

Author: tgross35