Rollup merge of #137356 - nik-rev:FERRIS, r=compiler-errors

Ferris 🦀 Identifier naming conventions

You cannot use Ferris as an identifier in Rust, this code will suggest to correct the  🦀 to `ferris`:

```rs
fn main() {
  let  🦀 = 4;
}
```

But it also suggests to correct to `ferris` in these cases, too:

```rs
struct  🦀 {}
fn main() {}
```

^ suggests: `ferris`
~ with this PR: `Ferris`

```rs
static 🦀: &str = "ferris!";
fn main() {}
```

^ suggests: `ferris`
~ with this PR: `FERRIS`

This is my first pull requests here!

1 files changed, 2 insertions, 1 deletions

diff --git a/compiler/rustc_interface/src/errors.rs b/compiler/rustc_interface/src/errors.rs
index ca4e556dcdb..eed729a1777 100644
--- a/compiler/rustc_interface/src/errors.rs
+++ b/compiler/rustc_interface/src/errors.rs
@@ -24,8 +24,9 @@ pub(crate) struct CrateNameInvalid<'a> {
 pub struct FerrisIdentifier {
     #[primary_span]
     pub spans: Vec<Span>,
-    #[suggestion(code = "ferris", applicability = "maybe-incorrect")]
+    #[suggestion(code = "{ferris_fix}", applicability = "maybe-incorrect")]
     pub first_span: Span,
+    pub ferris_fix: &'static str,
 }
 
 #[derive(Diagnostic)]